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Identification

Personal identification

Full name
Manuel Duarte Ortigueira

Citation names

  • Ortigueira, Manuel Duarte

Author identifiers

Ciência ID
391A-337F-6839
ORCID iD
0000-0003-4270-3284

Websites

Education
Degree Classification
1984/12/04
Concluded
 Engenharia Electrotécnica e de Computadores (Doutoramento)
Major in Sem especialidade
Universidade de Lisboa Instituto Superior Técnico, Portugal
"Metodologia, Implementação e Avaliação em Análise Espectral" (THESIS/DISSERTATION)
 Distinção e Louvor
Affiliation

Teaching in Higher Education

Category
Host institution 		Employer
2016 - 2018 Associate Professor (University Teacher) Universidade Nova de Lisboa, Portugal
2013 - 2016 Associate Professor (University Teacher) Universidade Nova de Lisboa Faculdade de Ciências e Tecnologia, Portugal

Others

Category
Host institution 		Employer
1997/02/01 - Current Aposentado Universidade Nova de Lisboa UNINOVA Instituto de Desenvolvimento de Novas Tecnologias, Portugal
Outputs

Publications

Book
  1. Ortigueira, Manuel Duarte; Valério, Duarte. Fractional Signals and Systems. De Gruyter. 2020.
    10.1515/9783110624588
  2. Costa, J.C.D.; Ortigueira, M.D.; Batista, A.; Paiva, T.. ARMA modelling for sleep disorders diagnose. 2013.
  3. Ortigueira, M.D.. Fractional linear shift-invariant systems. 2011.
    10.1007/978-94-007-0747-4_4
  4. Ortigueira, M.D.. A travel through the world of fractional calculus. 2011.
    10.1007/978-94-007-0747-4_1
  5. Ortigueira, M.D.. The fractional quantum derivative and the fractional linear scale invariant systems. 2011.
    10.1007/978-94-007-0747-4_6
  6. Ortigueira, M.D.. The causal fractional derivatives. 2011.
    10.1007/978-94-007-0747-4_2
  7. Ortigueira, M.D.. Where are we going to?. 2011.
    10.1007/978-94-007-0747-4_7
  8. Ortigueira, M.D.. Integral representations. 2011.
    10.1007/978-94-007-0747-4_3
  9. Manuel Duarte Ortigueira. Processamento Digital de Sinais. Funda{\c c. 2006.
Book chapter
  1. Ortigueira, Manuel D.. "The Complex Order Fractional Derivatives and Systems are Non Hermitian". In Proceedings of the International Conference on Fractional Differentiation and its Applications (ICFDA’21), 38-44. Springer International Publishing, 2022.
    10.1007/978-3-031-04383-3_3
  2. Manuel Duarte Ortigueira; Gabriel Bengochea. "Solving the fractional Ambartsumian equation". 155-158. 2022.
    10.34630/20734
  3. Manuel Duarte Ortigueira; Duarte Valério; António M. Lopes. "Continuous-time fractional linear systems: Transient responses". 119-148. De Gruyter, 2019.
    10.1515/9783110571745-006
  4. Gabriel Bengochea; Manuel Duarte Ortigueira; Luis Verde-Star; António Mendes Lopes. "Recursive-operational method for fractional systems: System theory without Laplace transform". 119-147. De Gruyter, 2019.
    10.1515/9783110571929-005
  5. Manuel Duarte Ortigueira; Jose Antonio Tenreiro Machado; Fernando Coito; Gabriel Bengochea. "Discrete-time fractional signals and systems". 149-178. De Gruyter, 2019.
    10.1515/9783110571929-006
  6. Duarte Valério; Manuel Duarte Ortigueira; J. A. Tenreiro Machado; António M. Lopes. "Continuous-time fractional linear systems: Steady-state responses". 149-174. De Gruyter, 2019.
    10.1515/9783110571745-007
  7. Matos, Carlos; Ortigueira, Manuel Duarte. "A New Approach to Rational Discrete-Time Approximations to Continuous-Time Fractional-Order Systems". In IFIP Advances in Information and Communication Technology, 251-258. Springer Berlin Heidelberg, 2012.
    10.1007/978-3-642-28255-3_27
Book review
  1. Ortigueira, Manuel D.. "Principles of fractional signal processing". http://hdl.handle.net/10362/172161.
    https://doi.org/10.1016/j.dsp.2024.104490
Conference paper
  1. Francisco Neves; Raul Rato; Manuel Duarte Ortigueira. "Trans-Boolean Cyber Physical Systems". 2023.
    10.1007/978-3-031-36007-7_22
  2. Filipa Esgalhado; Arnaldo Batista; V. B. Vassilenko; Manuel Duarte Ortigueira. "Real-Time PPG-Based HRV Implementation Using Deep Learning and Simulink". 2022.
    10.1007/978-3-031-07520-9_10
  3. Duarte Valério; Manuel Duarte Ortigueira. "Matsuda Method Adapted to Identify Fractional Order Transfer Functions". 2022.
    10.1007/978-3-031-04383-3_22
  4. Gabriel Bengochea; Manuel Duarte Ortigueira. "Operational Calculus with Applications to Generalized Two-Sided Fractional Derivative". 2022.
    10.1007/978-3-031-04383-3_17
  5. Manuel Duarte Ortigueira. "The Complex Order Fractional Derivatives and Systems are Non Hermitian". 2022.
    10.1007/978-3-031-04383-3_3
  6. Ortigueira, Manuel D.. "The Complex Order Fractional Derivatives and Systems are Non Hermitian". 2022.
    https://doi.org/10.1007/978-3-031-04383-3_3
  7. Filipa E. Cardoso; V. B. Vassilenko; Arnaldo Batista; Paulo Bonifácio; Sergio Rico Martin; Juan Muñoz-Torrero; Manuel Duarte Ortigueira. "Improvements on Signal Processing Algorithm for the VOPITB Equipment". 2021.
    10.1007/978-3-030-78288-7_31
  8. Filipa E. Cardoso; Arnaldo Batista; V. B. Vassilenko; Andreia Serrano; Manuel Duarte Ortigueira. "Idle Tone Detection in Biomedical Signals Using Time-Frequency Techniques". 2020.
    10.1007/978-3-030-45124-0_44
  9. Manuel Duarte Ortigueira. "On the Singular Steady-State Output in Discrete-Time Linear Systems". 2016.
  10. Manuel Duarte Ortigueira. "An Improved Empirical Mode Decomposition for Long Signals". 2016.
  11. Manuel Duarte Ortigueira. "On the computation of the Mittag-Leffler function". 2016.
  12. Ortigueira; Manuel; Troch; Inge. "A relation between the fractional derivative and the Hilbert transform". 2012.
    10.3182/20120215-3-at-3016.00106
  13. Manuel Duarte Ortigueira; DEE Group Author. "A Relation Between the Fractional Derivative and the Hilbert Transform". 2012.
    10.3182/20120215-3-AT-3016.00106
  14. Manuel Duarte Ortigueira; DEE Group Author. "Fractional Lower Order Moments in NMR: A New Measure of Tissue Complexity". 2010.
  15. Fernando Coito; Manuel Duarte Ortigueira; DEE Group Author. "Are RL and C derivatives really useful?". 2010.
  16. Manuel Duarte Ortigueira; DEE Group Author. "Generalized GL, Caputo, and Riemann-Liouville derivatives for analytic functions". 2010.
  17. Manuel Duarte Ortigueira; DEE Group Author. "The incremental ratio based causal Fractional Calculus for analytic functions". 2010.
  18. Fernando Coito; Manuel Duarte Ortigueira; DEE Group Author. "On a not so Fast Fourier Transform". 2010.
  19. Arnaldo Batista; Manuel Duarte Ortigueira; DEE Group Author. "FILTERS: Fractional vs Integer order". 2009.
  20. Ortigueira, M.D.; Ktonas, P. Y.; Golemati, S.; Xanthopoulos, P.; Ktonas, P.Y.; Sakkalis, V.; Tsekou, H.; et al. "Potential dementia biomarkers based on the time-varying microstructure of sleep EEG spindles". 2007.
    10.1109/IEMBS.2007.4352827
  21. Ortigueira, M.D.; Xanthopoulos, P.; Golemati, S.; Sakkalis, V.. "Comparative analysis of time-frequency methods estimating the time-varying microstructure of sleep EEG spindles". 2006.
  22. Ortigueira, Manuel Duarte; Matos, Carlos J. C.. "New results on fractional linear prediction". 2001.
    10.23919/ecc.2001.7076174
  23. Ortigueira, Manuel Duarte; Matos, J.C.; Piedade, M.S.. "Fractional signal processing: scale conversion". 2001.
Journal article
  1. Gabriel Bengochea; Manuel Ortigueira; Fernando Arroyo-Cabañas. "On the Inversion of the Mellin Convolution". Mathematics (2025): https://doi.org/10.3390/math13030432.
    10.3390/math13030432
  2. Manuel Duarte Ortigueira. "Fractional Calculus of Piecewise Continuous Functions". Fractal and Fractional (2025): https://doi.org/10.3390/fractalfract9020075.
    10.3390/fractalfract9020075
  3. Manuel Duarte Ortigueira; Gabriel Bengochea. "On Lebesgue Constants". Axioms (2024): https://doi.org/10.3390/axioms13080505.
    10.3390/axioms13080505
  4. Manuel Duarte Ortigueira. "A Factory of Fractional Derivatives". Symmetry (2024): https://www.mdpi.com/2073-8994/16/7/814.
    10.3390/sym16070814
  5. Manuel D. Ortigueira. "Principles of fractional signal processing". Digital Signal Processing (2024): https://doi.org/10.1016/j.dsp.2024.104490.
    10.1016/j.dsp.2024.104490
  6. Duarte Valério; Manuel D. Ortigueira. "Variable-Order Fractional Scale Calculus". Mathematics (2023): https://doi.org/10.3390/math11214549.
    10.3390/math11214549
  7. Manuel Duarte Ortigueira; Gabriel Bengochea. "On the Fractional Derivative Duality in Some Transforms". Mathematics (2023): https://doi.org/10.3390/math11214464.
    10.3390/math11214464
  8. Gabriel Bengochea; Manuel Duarte Ortigueira. "An Operational Approach to Fractional Scale-Invariant Linear Systems". Fractal and Fractional (2023): https://doi.org/10.3390/fractalfract7070524.
    10.3390/fractalfract7070524
  9. Manuel Duarte Ortigueira. "Discrete-Time Fractional Difference Calculus: Origins, Evolutions, and New Formalisms". Fractal and Fractional (2023): https://doi.org/10.3390/fractalfract7070502.
    10.3390/fractalfract7070502
  10. Manuel D. Ortigueira; Gary W. Bohannan. "Fractional Scale Calculus: Hadamard vs. Liouville". Fractal and Fractional (2023): https://doi.org/10.3390/fractalfract7040296.
    10.3390/fractalfract7040296
  11. Manuel Duarte Ortigueira; Valeriy Martynyuk; Volodymyr Kosenkov; Arnaldo Guimarães Batista. "A New Look at the Capacitor Theory". Fractal and Fractional (2023): https://doi.org/10.3390/fractalfract7010086.
    10.3390/fractalfract7010086
  12. Manuel Duarte Ortigueira; Gabriel Bengochea. "A Simple Solution for the General Fractional Ambartsumian Equation". Applied Sciences (2023): https://doi.org/10.3390/app13020871.
    10.3390/app13020871
  13. Valério, Duarte; Ortigueira, Manuel D.. "Variable-Order Fractional Scale Calculus". (2023): http://hdl.handle.net/10362/163982.
    https://doi.org/10.3390/math11214549
  14. Ortigueira, Manuel D.; Bohannan, Gary W.. "Fractional Scale Calculus". (2023): http://hdl.handle.net/10362/158090.
    https://doi.org/10.3390/fractalfract7040296
  15. Ortigueira, Manuel Duarte. "Discrete-Time Fractional Difference Calculus". (2023): http://hdl.handle.net/10362/158484.
    https://doi.org/10.3390/fractalfract7070502
  16. Bengochea, Gabriel; Ortigueira, Manuel Duarte. "An Operational Approach to Fractional Scale-Invariant Linear Systems". (2023): http://hdl.handle.net/10362/159683.
    https://doi.org/10.3390/fractalfract7070524
  17. Ortigueira, Manuel Duarte; Bengochea, Gabriel. "A Simple Solution for the General Fractional Ambartsumian Equation". (2023): http://hdl.handle.net/10362/155105.
    https://doi.org/10.3390/app13020871
  18. Ortigueira, Manuel Duarte; Martynyuk, Valeriy; Kosenkov, Volodymyr; Batista, Arnaldo Guimarães. "A New Look at the Capacitor Theory". (2023): http://hdl.handle.net/10362/155104.
    https://doi.org/10.3390/fractalfract7010086
  19. Ortigueira, Manuel Duarte; Bengochea, Gabriel. "On the Fractional Derivative Duality in Some Transforms". (2023): http://hdl.handle.net/10362/163980.
    https://doi.org/10.3390/math11214464
  20. Filipa Esgalhado; Valentina Vassilenko; Arnaldo Batista; Manuel Ortigueira. "On the Feasibility of Real-Time HRV Estimation Using Overly Noisy PPG Signals". Computers (2022): https://doi.org/10.3390/computers11120177.
    10.3390/computers11120177
  21. Müfit San; Manuel D. Ortigueira. "Unilateral Laplace Transforms on Time Scales". Mathematics (2022): https://doi.org/10.3390/math10234552.
    10.3390/math10234552
  22. Bengochea Gabriel; Ortigueira Manuel. "Fractional derivative of power type functions". Computational and Applied Mathematics (2022): https://doi.org/10.1007/s40314-022-02081-0.
    10.1007/s40314-022-02081-0
  23. Daniela Martins; Arnaldo Batista; Helena Mouriño; Sara Russo; Filipa Esgalhado; Catarina R. Palma dos Reis; Fátima Serrano; Manuel Ortigueira. "Adaptive Filtering for the Maternal Respiration Signal Attenuation in the Uterine Electromyogram". Sensors (2022): https://doi.org/10.3390/s22197638.
    10.3390/s22197638
  24. Manuel D. Ortigueira. "A New Series Representation and the Laplace Transform for the Lognormal Distribution". Mathematics (2022): https://doi.org/10.3390/math10193474.
    10.3390/math10193474
  25. Filipa Esgalhado; Arnaldo Batista; Valentina Vassilenko; Sara Russo; Manuel Ortigueira. "Peak Detection and HRV Feature Evaluation on ECG and PPG Signals". Symmetry (2022): https://doi.org/10.3390/sym14061139.
    10.3390/sym14061139
  26. Manuel D. Ortigueira. "A New Look at the Initial Condition Problem". Mathematics (2022): https://doi.org/10.3390/math10101771.
    10.3390/math10101771
  27. Martim Almeida; Helena Mouriño; Arnaldo G. Batista; Sara Russo; Filipa Esgalhado; Catarina R. Palma dos Reis; Fátima Serrano; Manuel Ortigueira. "Electrohysterography extracted features dependency on anthropometric and pregnancy factors". Biomedical Signal Processing and Control (2022): https://doi.org/10.1016/j.bspc.2022.103556.
    10.1016/j.bspc.2022.103556
  28. Manuel Duarte Ortigueira; Richard L. Magin. "On the Equivalence between Integer- and Fractional Order-Models of Continuous-Time and Discrete-Time ARMA Systems". Fractal and Fractional 6 5 (2022): 242-242. https://doi.org/10.3390/fractalfract6050242.
    10.3390/fractalfract6050242
  29. Duarte Valério; Manuel D. Ortigueira; António M. Lopes. "How Many Fractional Derivatives Are There?". Mathematics (2022): https://doi.org/10.3390/math10050737.
    10.3390/math10050737
  30. Müfit San; Arnaldo Batista; Sara Russo; Filipa Esgalhado; Catarina R. Palma dos Reis; Fátima Serrano; Manuel Ortigueira. "A Preliminary Exploration of the Placental Position Influence on Uterine Electromyography Using Fractional Modelling". Sensors (2022): https://doi.org/10.3390/s22051704.
    10.3390/s22051704
  31. Manuel Duarte Ortigueira; J.A. Tenreiro Machado. "The 21st Century Systems: An Updated Vision of Discrete-Time Fractional Models". IEEE Circuits and Systems Magazine (2022): https://doi.org/10.1109/MCAS.2022.3160908.
    10.1109/MCAS.2022.3160908
  32. Gabriel Bengochea; Luís Verde-Star; Manuel Duarte Ortigueira. "Solution of Equations with q-Derivatives and Ward’s Derivatives Using an Operational Method". Filomat 36 5 (2022): 1487-1498. https://novaresearch.unl.pt/en/publications/baafb9ee-6fd4-4062-a484-03021d4dd7c1.
    10.2298/FIL2205487B
  33. Manuel Duarte Ortigueira; J. Tenreiro Machado. "The 21st Century Systems: An Updated Vision of Continuous-Time Fractional Models". IEEE Circuits and Systems Magazine 22 2 (2022): 36-56. https://novaresearch.unl.pt/en/publications/f2e9e624-ccc2-44bd-9e21-35b6ea098839.
    10.1109/MCAS.2022.3160905
  34. Ortigueira, Manuel D.. "A New Series Representation and the Laplace Transform for the Lognormal Distribution". (2022): http://hdl.handle.net/10362/148296.
    https://doi.org/10.3390/math10193474
  35. San, Müfit; Ortigueira, Manuel D.. "Unilateral Laplace Transforms on Time Scales". (2022): http://hdl.handle.net/10362/148295.
    https://doi.org/10.3390/math10234552
  36. Ortigueira, Manuel Duarte; Magin, Richard L.. "On the Equivalence between Integer-and Fractional Order-Models of Continuous-Time and Discrete-Time ARMA Systems". (2022): http://hdl.handle.net/10362/143502.
    https://doi.org/10.3390/fractalfract6050242
  37. Ortigueira, Manuel Duarte; Machado, J. Tenreiro. "The 21st Century Systems". (2022): http://hdl.handle.net/10362/148648.
    https://doi.org/10.1109/MCAS.2022.3160905
  38. Esgalhado, Filipa; Vassilenko, Valentina; Batista, Arnaldo; Ortigueira, Manuel. "On the Feasibility of Real-Time HRV Estimation Using Overly Noisy PPG Signals". (2022): http://hdl.handle.net/10362/148292.
    https://doi.org/10.3390/computers11120177
  39. Bengochea, Gabriel; Verde-Star, Luís; Ortigueira, Manuel. "Solution of Equations with q-Derivatives and Ward’s Derivatives Using an Operational Method". (2022): http://hdl.handle.net/10362/158000.
    https://doi.org/10.2298/FIL2205487B
  40. Esgalhado, Filipa; Batista, Arnaldo; Vassilenko, Valentina; Russo, Sara; Ortigueira, Manuel. "Peak Detection and HRV Feature Evaluation on ECG and PPG Signals". (2022): http://hdl.handle.net/10362/143506.
    https://doi.org/10.3390/sym14061139
  41. Gabriel, Bengochea; Manuel, Ortigueira. "Fractional derivative of power type functions". (2022): http://hdl.handle.net/10362/148647.
    https://doi.org/10.1007/s40314-022-02081-0
  42. Ortigueira, Manuel D.. "A New Look at the Initial Condition Problem". (2022): http://hdl.handle.net/10362/143916.
    https://doi.org/10.3390/math10101771
  43. Valério, Duarte; Ortigueira, Manuel D.; Lopes, António M.. "How Many Fractional Derivatives Are There?". (2022): http://hdl.handle.net/10362/143802.
    https://doi.org/10.3390/math10050737
  44. Ortigueira, Manuel Duarte; Machado, J. A. Tenreiro. "The 21st Century Systems". (2022): http://hdl.handle.net/10362/148649.
    https://doi.org/10.1109/MCAS.2022.3160908
  45. Manuel Duarte Ortigueira. "An Entropy Paradox Free Fractional Diffusion Equation". Fractal and Fractional 5 4 (2021): 236-236. https://doi.org/10.3390/fractalfract5040236.
    10.3390/fractalfract5040236
  46. Manuel Duarte Ortigueira. "Editorial for Special Issue “Fractional Behavior in Nature 2019”". Fractal and Fractional (2021): https://doi.org/10.3390/fractalfract5040186.
    10.3390/fractalfract5040186
  47. Manuel D. Ortigueira; Gabriel Bengochea; J. Tenreiro Machado. "Substantial, tempered, and shifted fractional derivatives: Three faces of a tetrahedron". Mathematical Methods in the Applied Sciences 44 11 (2021): 9191-9209. https://doi.org/10.1002/mma.7343.
    10.1002/mma.7343
  48. Gabriel Bengochea; Manuel Ortigueira. "Fractional Line Integral". Mathematics (2021): https://doi.org/10.3390/math9101150.
    10.3390/math9101150
  49. Manuel Duarte Ortigueira; Gabriel Bengochea; Manuel D. Ortigueira. "Bilateral Tempered Fractional Derivatives". Symmetry (2021): https://doi.org/10.3390/sym13050823.
    10.3390/sym13050823
  50. Arnaldo Batista; Ricardo Cebola; Filipa Esgalhado; Sara Russo; Catarina Palma dos Reis; Fatima Serrano; V. B. Vassilenko; Manuel Duarte Ortigueira. "The contractiongram: A method for the visualization of uterine contraction evolution using the electrohysterogram". Biomedical Signal Processing and Control 67 (2021): https://novaresearch.unl.pt/en/publications/045bf419-82c6-41a2-82fc-32e4ed6e333d.
    10.1016/j.bspc.2021.102531
  51. Manuel Duarte Ortigueira; José Tenreiro Machado. "A Review of Sample and Hold Systems and Design of a New Fractional Algorithm". Applied Sciences (2020): https://doi.org/10.3390/app10207360.
    10.3390/app10207360
  52. Filipa Esgalhado; Arnaldo G. Batista; Helena Mouriño; Sara Russo; Catarina Palma dos Reis; Fátima Serrano; Valentina Vassilenko; Manuel Duarte Ortigueira. "Automatic Contraction Detection Using Uterine Electromyography". Applied Sciences (2020): https://www.mdpi.com/2076-3417/10/20/7014.
    10.3390/app10207014
  53. Manuel D. Ortigueira; J.A. Tenreiro Machado. "New discrete-time fractional derivatives based on the bilinear transformation: Definitions and properties". Journal of Advanced Research (2020): https://doi.org/10.1016/j.jare.2020.02.011.
    10.1016/j.jare.2020.02.011
  54. Manuel Duarte Ortigueira; José Tenreiro Machado. "Revisiting the 1D and 2D Laplace Transforms". Mathematics 8 8 (2020): 1330-1330. https://doi.org/10.3390/math8081330.
    10.3390/math8081330
  55. Filipa Esgalhado; Arnaldo Batista; Helena Mouriño; Sara Russo; Catarina Palma dos Reis; Fatima Serrano; V. B. Vassilenko; Manuel Duarte Ortigueira. "Uterine contractions clustering based on electrohysterography". Computers in Biology and Medicine 123 (2020): https://novaresearch.unl.pt/en/publications/11e6a94a-c869-4cde-a790-79432af567e5.
    10.1016/j.compbiomed.2020.103897
  56. Ortigueira, Manuel D.; Lopes, António M.; Tenreiro Machado, José; Manuel Duarte Ortigueira; António M. Lopes; José Tenreiro Machado. "On the Numerical Computation of the Mittag-Leffler Function". International Journal of Nonlinear Sciences and Numerical Simulation 20 6 (2019): 725-736. http://hdl.handle.net/10362/99790.
    https://doi.org/10.1515/ijnsns-2018-0358
  57. Ortigueira, Manuel D.; Tenreiro Machado, J.. "A critical analysis of the Caputo–Fabrizio operator". Communications in Nonlinear Science and Numerical Simulation 59 (2018): 608-611. http://dx.doi.org/10.1016/j.cnsns.2017.12.001.
    10.1016/j.cnsns.2017.12.001
  58. Ortigueira, Manuel Duarte. "Fractional Definite Integral". Fractal and Fractional (2017): doi:10.3390/fractalfract1010002.
    10.3390/fractalfract1010002
  59. Ortigueira, Manuel Duarte. "Which Derivative?". Fractal and Fractional (2017): http://www.mdpi.com/2504-3110/1/1/3.
    10.3390/fractalfract1010003
  60. Manuel Duarte Ortigueira. "On the Steady-State Behaviour of Discrete-Time Linear Systems with Poles on the Unit Circle". Sensors & Transducers Journal 204 9 (2016): 39-44. https://novaresearch.unl.pt/en/publications/74f47e1c-948d-466d-aa6d-676fcdcec8e0.
  61. Manuel Duarte Ortigueira. "A Sliding Window Empirical Mode Decomposition for Long Signals Algorithm". Sensors & Transducers Journal 204 9 (2016): 21-28. https://novaresearch.unl.pt/en/publications/0d905a0c-0424-4271-9265-06d43815c0f3.
  62. Ortigueira, Manuel D.; Torres, Delfim F.M.; Trujillo, Juan J.; Manuel D. Ortigueira; Delfim F.M. Torres; Juan J. Trujillo. "Exponentials and Laplace transforms on nonuniform time scales". Communications in Nonlinear Science and Numerical Simulation 39 (2016): 252-270. http://hdl.handle.net/10773/16656.
    10.1016/j.cnsns.2016.03.010
  63. Ortigueira, Manuel D.; Serralheiro, António S.; Machado, J. A. Tenreiro. "A new zoom algorithm and its use in frequency estimation". (2015): http://hdl.handle.net/10400.22/8791.
    10.1515/wwfaa-2015-0002
  64. Ortigueira, M.D.. "Advanced digital signal processing and coding for multi-Tb/s optical transport". IEEE Signal Processing Magazine 31 2 (2014): 15-16. http://www.scopus.com/inward/record.url?eid=2-s2.0-84894770635&partnerID=MN8TOARS.
    10.1109/MSP.2013.2288652
  65. Manuel Duarte Ortigueira; Arnaldo Batista. "K-means Clustering for Sleep Spindles Classification". International Journal of Information Technology & Computer Science 10 3 (2013): 77-85. https://novaresearch.unl.pt/en/publications/5071661c-5f30-4c83-ba7c-a4302eb40e6f.
  66. Arnaldo Batista; Manuel Duarte Ortigueira; DEE Group Author. "Sleep Spindles Detection: a Mixed Method using STFT and WMSD". International Journal Of Bioelectromagnetism 14 4 (2012): 229-233. https://novaresearch.unl.pt/en/publications/70d39a44-2031-40d8-b7ae-e15a1cdcb6ce.
  67. Manuel Duarte Ortigueira; Fernando Coito; DEE Group Author. "On the usefulness of Riemann-Liouville and Caputo derivatives in describing fractional shift-invariant linear systems". Journal of Applied Nonlinear Dynamics 1 2 (2012): 113-124. https://novaresearch.unl.pt/en/publications/830c84c7-2985-4848-a323-bd6c14aeb039.
    10.5890/JAND.2012.05.001
  68. Manuel Duarte Ortigueira; DEE Group Author. "On the Estimation of the Autocorrelation Function". Discussiones Mathematicae: Probability and Statistics 38 NA (2010): 85-97. https://novaresearch.unl.pt/en/publications/4c83fc4a-2cb1-4625-a2d8-7bc28f477013.
  69. Ortigueira, M.D.. "An introduction to the fractional continuous-time linear systems". IEEE Circuits and Systems Magazine 8 3 (2008): 19-26. http://hdl.handle.net/10362/1717.
    Published • 10.1109/MCAS.2008.928419
  70. Ortigueira, M.D.; Rato, R.T.; Batista, A. G.; Rato, R. T.; Batista, A.G.. "On the HHT, its problems, and some solutions". Mechanical Systems and Signal Processing 22 6 (2008): 1374-1394. http://hdl.handle.net/10362/2415.
    Published • 10.1016/j.ymssp.2007.11.028
  71. Ortigueira, M.D.. "On the fractional central differences and derivatives". (2008): http://hdl.handle.net/10362/1718.
  72. Ortigueira, M.D.; Serralheiro, António J.; Ortigueira, M. D.. "A new least-squares approach to differintegration modeling". Signal Processing 86 10 (2006): 2582-2591. http://hdl.handle.net/10362/2587.
    10.1016/j.sigpro.2006.02.013
  73. Ortigueira, M.D.. "Riesz potential operators and inverses via fractional centred derivatives". (2006): http://hdl.handle.net/10362/2588.
  74. Ortigueira, M.D.. "A coherent approach to non-integer order derivatives". (2006): http://hdl.handle.net/10362/2586.
  75. Ortigueira, M.D.. "Introduction to fractional linear systems. Part 2: discrete-time case". (2000): http://hdl.handle.net/10362/2615.
  76. Ortigueira, M.D.. "Introduction to fractional linear systems. Part 2: discrete-time case". IEE Proceedings: Vision, Image and Signal Processing 147 1 (2000): 71-78. http://www.scopus.com/inward/record.url?eid=2-s2.0-0033899008&partnerID=MN8TOARS.
    10.1049/ip-vis:20000273
Preprint
  1. Manuel Duarte Ortigueira. "The Power Functions and Their Relations to the Unified Fractional Derivative". 2025. https://doi.org/10.20944/preprints202502.0791.v1.
    10.20944/preprints202502.0791.v1
  2. Manuel Duarte Ortigueira. "Fractional Calculus of Piecewise Continuous Functions". 2024. https://doi.org/10.20944/preprints202412.2114.v1.
    10.20944/preprints202412.2114.v1
  3. Manuel Duarte Ortigueira; Gabriel Bengochea. "On the Lebesgue Constants". 2024. https://doi.org/10.20944/preprints202405.1746.v1.
    10.20944/preprints202405.1746.v1
  4. Manuel D. Ortigueira. "A Factory of Fractional Derivatives". 2024. https://doi.org/10.20944/preprints202406.0319.v1.
    10.20944/preprints202406.0319.v1
  5. Manuel Duarte Ortigueira; Gabriel Bengochea. "On the fractional derivative duality in some transforms". 2023. https://doi.org/10.20944/preprints202310.0395.v1.
    10.20944/preprints202310.0395.v1
  6. Manuel Ortigueira. "Discrete-Time Fractional Difference Calculus: Origins, Evolutions, and New Formalisms". 2023. https://doi.org/10.20944/preprints202305.0734.v1.
    10.20944/preprints202305.0734.v1
  7. Manuel Ortigueira; Gabriel Bengochea. "A simple solution for the general fractional Ambartsumian equation". 2022. https://doi.org/10.22541/au.165485531.18759027/v1.
    10.22541/au.165485531.18759027/v1

Other

Other output
  1. The Complex Order Fractional Derivatives and Systems Are Non Hermitian. 2021. Manuel Ortigueira. https://doi.org/10.20944/preprints202103.0399.v1.
    10.20944/preprints202103.0399.v1
  2. Corrigendum to “On the computation of the multidimensional Mittag–Leffler function” (Commun. Nonlinear Sci. Numer. Simulat. (2017) 53 (278–287) (S1007570417301594) (10.1016/j.cnsns.2017.05.007)). 2018. Manuel Duarte Ortigueira; António M. Lopes; J. A. Tenreiro Machado. https://novaresearch.unl.pt/en/publications/0b3a1a7e-2881-4e08-8f22-3e334960649d.
    10.1016/j.cnsns.2017.07.002