On the double Levinson recursion formulation of ARMA spectral estimation. - Manuel Duarte Ortigueira; José M. Tribolet (ICASSP, 1983)

A framework for the evaluation of spectral analysis techniques. - Manuel Duarte Ortigueira; José M. Tribolet (ICASSP, 1984)

A weighted min-norm method with a recursive implementation. - Manuel Duarte Ortigueira; Miguel Angel Lagunas (ICASSP, 1990)

Eigendecomposition versus singular value decomposition in adaptive array signal processing. - Manuel Duarte Ortigueira; Miguel Angel Lagunas (Signal Process., 1991)

ARMA realization from the reflection coefficient sequence. - Manuel Duarte Ortigueira (Signal Process., 1993)

A new algorithm for the factorization and inversion of recursively generated matrices. - Manuel Duarte Ortigueira (Signal Process., 1996)

Fractional discrete-time linear systems. - Manuel Duarte Ortigueira (ICASSP, 1997)

A signal processing view of differintegration. - Manuel Duarte Ortigueira; Arnaldo G. Batista (ECC, 2001)

New results on fractional linear prediction. - Manuel Duarte Ortigueira; Carlos J. C. Matos (ECC, 2001)

The comb signal and its Fourier transform. - Manuel Duarte Ortigueira (Signal Process., 2001)

Low-voltage low-power CMOS analogue circuits for Gaussian and uniform noise generation. - Guiomar Evans; João Goes; Adolfo Steiger-Garção; Manuel Duarte Ortigueira; Nuno F. Paulino; Jilseph Lopes Silva (ISCAS (1), 2003)

Efficient digital self-calibration of video-rate pipeline ADCs using white Gaussian noise. - M. Unterweissacher; João Goes; Nuno F. Paulino; Guiomar Evans; Manuel Duarte Ortigueira (ISCAS (1), 2003)

On the initial conditions in continuous-time fractional linear systems. - Manuel Duarte Ortigueira (Signal Process., 2003)

A new symmetric fractional B-spline. - Manuel Duarte Ortigueira (Signal Process., 2003)

Fractional signal processing and applications. - Manuel Duarte Ortigueira; José António Tenreiro Machado (Signal Process., 2003)

New PN Even Balanced Sequences for Spread-Spectrum Systems. - José A. L. Inácio; José António Beltran Gerald; Manuel Duarte Ortigueira (EURASIP J. Wirel. Commun. Netw., 2005)

Riesz potential operators and inverses via fractional centred derivatives. - Manuel Duarte Ortigueira (Int. J. Math. Math. Sci., 2006)

A coherent approach to non-integer order derivatives. - Manuel Duarte Ortigueira (Signal Process., 2006)

Fractional calculus applications in signals and systems. - Manuel Duarte Ortigueira; José António Tenreiro Machado (Signal Process., 2006)

A new least-squares approach to differintegration modeling. - Manuel Duarte Ortigueira; António Joaquim Serralheiro (Signal Process., 2006)

Wireless Systems New quasi-orthogonal BCH-derived sequences for CDMA applications. - Cesaltina N. E. Ricardo; Manuel Duarte Ortigueira; José António Beltran Gerald (Eur. Trans. Telecommun., 2007)

On the Linear Scale Fractional Systems - An Application of the Fractional Quantum Derivative. - Manuel Duarte Ortigueira (ICINCO-SPSMC, 2009)

A Contribution for the Automatic Sleep Classification Based on the Itakura-Saito Spectral Distance. - Eduardo Cardoso; Arnaldo Batista; Rui Rodrigues; Manuel Duarte Ortigueira; Cristina Bárbara; Cristina Martinho; Raul Tello Rato (DoCEIS, 2010)

Railscan: A Tool for the Detection and Quantification of Rail Corrugation. - Rui Gomes; Arnaldo Batista; Manuel Duarte Ortigueira; Raul Tello Rato; Marco Baldeiras (DoCEIS, 2010)

Fractional Filters: An Optimization Approach. - Carlos J. C. Matos; Manuel Duarte Ortigueira (DoCEIS, 2010)

MicroECG: An Integrated Platform for the Cardiac Arrythmia Detection and Characterization. - Bruno Nascimento; Arnaldo Batista; Luis Brandão Alves; Manuel Duarte Ortigueira; Raul Tello Rato (DoCEIS, 2010)

System initial conditions vs derivative initial conditions. - Manuel Duarte Ortigueira; Fernando J. V. Coito (Comput. Math. Appl., 2010)

On the Fractional Linear Scale Invariant Systems. - Manuel Duarte Ortigueira (IEEE Trans. Signal Process., 2010)

ARMA Modelling of Sleep Spindles. - João Caldas da Costa; Manuel Duarte Ortigueira; Arnaldo Batista (DoCEIS, 2011)

On the fractional signals and systems. - Richard L. Magin; Manuel Duarte Ortigueira; Igor Podlubny; Juan J. Trujillo (Signal Process., 2011)

Fractional signals and systems. - Manuel Duarte Ortigueira; J. A. Tenreiro Machado; Juan J. Trujillo; Blas M. Vinagre (Signal Process., 2011)

Fractional Calculus for Scientists and Engineers - Manuel Duarte Ortigueira (Springer, 2011)

Short Time Fourier Transform and Automatic Visual Scoring for the Detection of Sleep Spindles. - João Caldas da Costa; Manuel Duarte Ortigueira; Arnaldo Batista (DoCEIS, 2012)

A New Approach to Rational Discrete-Time Approximations to Continuous-Time Fractional-Order Systems. - Carlos J. C. Matos; Manuel Duarte Ortigueira (DoCEIS, 2012)

The Incremental Ratio Based Causal fractional Calculus. - Manuel Duarte Ortigueira; Margarita Rivero; Juan J. Trujillo (Int. J. Bifurc. Chaos, 2012)

A real regularised fractional derivative. - Manuel Duarte Ortigueira; Richard L. Magin; Juan J. Trujillo; M. Pilar Velasco (Signal Image Video Process., 2012)

ARMA Modelling for Sleep Disorders Diagnose. - João Caldas da Costa; Manuel Duarte Ortigueira; Arnaldo Batista; Teresa Paiva (DoCEIS, 2013)

A simple approach to the particular solution of constant coefficient ordinary differential equations. - Manuel Duarte Ortigueira (Appl. Math. Comput., 2014)

On the particular solution of constant coefficient fractional differential equations. - Manuel Duarte Ortigueira (Appl. Math. Comput., 2014)

Comments on "The fractional Laplace transform". - Manuel Duarte Ortigueira (Signal Image Video Process., 2014)

On the Recursive Solution to the Normal Equations: Some Other Results [Lecture Notes]. - Manuel Duarte Ortigueira (IEEE Signal Process. Mag., 2014)

Comments on "Discretization of fractional order differentiator over Paley-Wiener space". - Manuel Duarte Ortigueira (Appl. Math. Comput., 2015)

From a generalised Helmholtz decomposition theorem to fractional Maxwell equations. - Manuel Duarte Ortigueira; Margarita Rivero; Juan J. Trujillo (Commun. Nonlinear Sci. Numer. Simul., 2015)

What is a fractional derivative? - Manuel Duarte Ortigueira; J. A. Tenreiro Machado (J. Comput. Phys., 2015)

Fractional model of an electrochemical capacitor. - Valeriy Martynyuk; Manuel Duarte Ortigueira (Signal Process., 2015)

Discrete-time differential systems. - Manuel Duarte Ortigueira; Fernando J. V. Coito; Juan J. Trujillo (Signal Process., 2015)

Fractional signal processing and applications. - Manuel Duarte Ortigueira; Clara M. Ionescu; J. Tenreiro Machado; Juan J. Trujillo (Signal Process., 2015)

Integer/fractional decomposition of the impulse response of fractional linear systems. - Manuel Duarte Ortigueira; J. Tenreiro Machado; Margarita Rivero; Juan J. Trujillo (Signal Process., 2015)

A generalized power series and its application in the inversion of transfer functions. - Manuel Duarte Ortigueira; Juan J. Trujillo; Valery I. Martynyuk; Fernando J. V. Coito (Signal Process., 2015)

A multichannel time-frequency and multi-wavelet toolbox for uterine electromyography processing and visualisation. - Arnaldo Batista; Shirin Najdi; Daniela M. Godinho; Catarina Martins; Fátima C. Serrano; Manuel Duarte Ortigueira; Raul Tello Rato (Comput. Biol. Medicine, 2016)

Exponentials and Laplace transforms on nonuniform time scales. - Manuel Duarte Ortigueira; Delfim F. M. Torres; Juan J. Trujillo (Commun. Nonlinear Sci. Numer. Simul., 2016)

On the computation of the multidimensional Mittag-Leffler function. - Manuel Duarte Ortigueira; António M. Lopes 001; J. A. Tenreiro Machado (Commun. Nonlinear Sci. Numer. Simul., 2017)

Reducing bias in fractional order impedance estimation for lung function evaluation. - Dana Copot; Robin De Keyser; Eric Derom; Manuel Duarte Ortigueira; Clara M. Ionescu (Biomed. Signal Process. Control., 2018)

Corrigendum to "On the computation of the multidimensional Mittag-Leffler function" [Commun. Nonlinear Sci. Numer. Simulat. 53 (2017) 278-287]. - Manuel Duarte Ortigueira; António M. Lopes 001; J. A. Tenreiro Machado (Commun. Nonlinear Sci. Numer. Simul., 2018)

A critical analysis of the Caputo-Fabrizio operator. - Manuel Duarte Ortigueira; J. Tenreiro Machado (Commun. Nonlinear Sci. Numer. Simul., 2018)

Variable order fractional systems. - Manuel Duarte Ortigueira; Duarte Valério; J. Tenreiro Machado (Commun. Nonlinear Sci. Numer. Simul., 2019)

Idle Tone Detection in Biomedical Signals Using Time-Frequency Techniques. - Filipa E. Cardoso; Arnaldo Batista; Valentina Vassilenko; Andreia Serrano; Manuel Duarte Ortigueira (DoCEIS, 2020)

Uterine contractions clustering based on electrohysterography. - Filipa Esgalhado; Arnaldo Batista; Helena Mouriño; Sara Russo; Catarina R. Palma dos Reis; Fátima C. Serrano; Valentina Vassilenko; Manuel Duarte Ortigueira (Comput. Biol. Medicine, 2020)

On the properties of some operators under the perspective of fractional system theory. - Manuel Duarte Ortigueira; J. Tenreiro Machado (Commun. Nonlinear Sci. Numer. Simul., 2020)

Improvements on Signal Processing Algorithm for the VOPITB Equipment. - Filipa E. Cardoso; Valentina Vassilenko; Arnaldo Batista; Paulo Bonifácio; Sergio Rico Martin; Juan Muñoz-Torrero; Manuel Duarte Ortigueira (DoCEIS, 2021)

The contractiongram: A method for the visualization of uterine contraction evolution using the electrohysterogram. - Arnaldo G. Batista; Ricardo Cebola; Filipa Esgalhado; Sara Russo; Catarina R. Palma dos Reis; Fátima C. Serrano; Valentina Vassilenko; Manuel Duarte Ortigueira (Biomed. Signal Process. Control., 2021)

Bilateral Tempered Fractional Derivatives. - Manuel Duarte Ortigueira; Gabriel Bengochea (Symmetry, 2021)

Real-Time PPG-Based HRV Implementation Using Deep Learning and Simulink. - Filipa Esgalhado; Arnaldo Batista; Valentina Vassilenko; Manuel Duarte Ortigueira (DoCEIS, 2022)

Electrohysterography extracted features dependency on anthropometric and pregnancy factors. - Martim Almeida; Helena Mouriño; Arnaldo G. Batista; Sara Russo; Filipa Esgalhado; Catarina R. Palma dos Reis; Fátima C. Serrano; Manuel Duarte Ortigueira (Biomed. Signal Process. Control., 2022)

On the Feasibility of Real-Time HRV Estimation Using Overly Noisy PPG Signals. - Filipa Esgalhado; Valentina Vassilenko; Arnaldo Batista; Manuel Duarte Ortigueira (Comput., 2022)

Adaptive Filtering for the Maternal Respiration Signal Attenuation in the Uterine Electromyogram. - Daniela Martins; Arnaldo Batista; Helena Mouriño; Sara Russo; Filipa Esgalhado; Catarina R. Palma dos Reis; Fátima C. Serrano; Manuel Duarte Ortigueira (Sensors, 2022)

A Preliminary Exploration of the Placental Position Influence on Uterine Electromyography Using Fractional Modelling. - Müfit San; Arnaldo Batista; Sara Russo; Filipa Esgalhado; Catarina R. Palma dos Reis; Fátima C. Serrano; Manuel Duarte Ortigueira (Sensors, 2022)

Peak Detection and HRV Feature Evaluation on ECG and PPG Signals. - Filipa Esgalhado; Arnaldo Batista; Valentina Vassilenko; Sara Russo; Manuel Duarte Ortigueira (Symmetry, 2022)

Fractional derivative of power type functions. - Gabriel Bengochea; Manuel Duarte Ortigueira (Comput. Appl. Math., 2022)

Trans-Boolean Cyber Physical Systems. - Francisco Neves; Raul Tello Rato; Manuel Duarte Ortigueira (DoCEIS, 2023)

Principles of fractional signal processing. - Manuel Duarte Ortigueira (Digit. Signal Process., 2024)

The causal α -exponential and the solution of fractional linear time-invariant systems. - Gabriel Bengochea; Manuel Duarte Ortigueira; Luis Verde-Star (Int. J. Syst. Sci., 2024)

A Factory of Fractional Derivatives. - Manuel Duarte Ortigueira (Symmetry, 2024)

On Lebesgue Constants. - Manuel Duarte Ortigueira; Gabriel Bengochea (Axioms, 2024)