Calculus of variations with fractional derivatives and fractional integrals. - Ricardo Almeida 001; Delfim F. M. Torres (Appl. Math. Lett., 2009)

Leitmann's direct method for fractional optimization problems. - Ricardo Almeida 001; Delfim F. M. Torres (Appl. Math. Comput., 2010)

Connectedness and compactness on standard sets. - Ricardo Almeida 001 (Math. Log. Q., 2010)

Fractional variational calculus for nondifferentiable functions. - Ricardo Almeida 001; Delfim F. M. Torres (Comput. Math. Appl., 2011)

Fractional variational problems with the Riesz-Caputo derivative. - Ricardo Almeida 001 (Appl. Math. Lett., 2012)

Approximation of fractional integrals by means of derivatives. - Shakoor Pooseh; Ricardo Almeida 001; Delfim F. M. Torres (Comput. Math. Appl., 2012)

Free time fractional optimal control problems. - Shakoor Pooseh; Ricardo Almeida 001; Delfim F. M. Torres (ECC, 2013)

General necessary conditions for infinite horizon fractional variational problems. - Ricardo Almeida 001 (Appl. Math. Lett., 2013)

Discrete direct methods in the fractional calculus of variations. - Shakoor Pooseh; Ricardo Almeida 001; Delfim F. M. Torres (Comput. Math. Appl., 2013)

Generalized transversality conditions in fractional calculus of variations. - Ricardo Almeida 001; Agnieszka B. Malinowska (Commun. Nonlinear Sci. Numer. Simul., 2013)

Existence results for fractional q-difference equations of order α∈]2, 3[ with three-point boundary conditions. - Ricardo Almeida 001; Natália Martins (Commun. Nonlinear Sci. Numer. Simul., 2014)

Computing Hadamard type operators of variable fractional order. - Ricardo Almeida 001; Delfim F. M. Torres (Appl. Math. Comput., 2015)

Caputo derivatives of fractional variable order: Numerical approximations. - Dina Tavares; Ricardo Almeida 001; Delfim F. M. Torres (Commun. Nonlinear Sci. Numer. Simul., 2016)

Non-invasive Control of the Fractional Hegselmann-Krause Type Model. - Ricardo Almeida 001; Agnieszka B. Malinowska; Tatiana Odzijewicz (RRNR, 2017)

A Caputo fractional derivative of a function with respect to another function. - Ricardo Almeida 001 (Commun. Nonlinear Sci. Numer. Simul., 2017)

Constrained fractional variational problems of variable order. - Dina Tavares; Ricardo Almeida 001; Delfim F. M. Torres (IEEE CAA J. Autom. Sinica, 2017)

Variational Problems Involving a Caputo-Type Fractional Derivative. - Ricardo Almeida 001 (J. Optim. Theory Appl., 2017)

Fractional Opinion Formation Models with Leadership. - Ricardo Almeida 001; Agnieszka B. Malinowska; Tatiana Odzijewicz (MMAR, 2018)

An Extension of the Fractional Gronwall Inequality. - Ricardo Almeida 001; Agnieszka B. Malinowska; Tatiana Odzijewicz (RRNR, 2018)

The Euler-Lagrange and Legendre equations for functionals involving distributed-order fractional derivatives. - Ricardo Almeida 001; Maria Luísa Morgado (Appl. Math. Comput., 2018)

Analysis of a fractional SEIR model with treatment. - Ricardo Almeida 001 (Appl. Math. Lett., 2018)

Combined fractional variational problems of variable order and some computational aspects. - Dina Tavares; Ricardo Almeida 001; Delfim F. M. Torres (J. Comput. Appl. Math., 2018)

Fractional differential equations and Volterra-Stieltjes integral equations of the second kind. - Avyt Asanov; Ricardo Almeida 001; Agnieszka B. Malinowska (Comput. Appl. Math., 2019)

Analysis and numerical approximation of tempered fractional calculus of variations problems. - Ricardo Almeida 001; Maria Luísa Morgado (J. Comput. Appl. Math., 2019)

Optimal Leader-Follower Control for the Fractional Opinion Formation Model. - Ricardo Almeida 001; Agnieszka B. Malinowska; Tatiana Odzijewicz (J. Optim. Theory Appl., 2019)

On Leader-Following Consensus in Multi-Agent Systems with Discrete Updates at Random Times. - Ricardo Almeida 001; Ewa Girejko; Snezhana G. Hristova; Agnieszka B. Malinowska (Entropy, 2020)

Quadratic Lyapunov Functions for Stability of the Generalized Proportional Fractional Differential Equations with Applications to Neural Networks. - Ricardo Almeida 001; Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2021)

Global Stability Condition for the Disease-Free Equilibrium Point of Fractional Epidemiological Models. - Ricardo Almeida 001; Natália Martins; Cristiana J. Silva (Axioms, 2021)

On the necessary optimality conditions for the fractional Cucker-Smale optimal control problem. - Ricardo Almeida 001; Rafal Kamocki; Agnieszka B. Malinowska; Tatiana Odzijewicz (Commun. Nonlinear Sci. Numer. Simul., 2021)

Optimal leader-following consensus of fractional opinion formation models. - Ricardo Almeida 001; Rafal Kamocki; Agnieszka B. Malinowska; Tatiana Odzijewicz (J. Comput. Appl. Math., 2021)

New Variational Problems with an Action Depending on Generalized Fractional Derivatives, the Free Endpoint Conditions, and a Real Parameter. - Ricardo Almeida 001; Natália Martins (Symmetry, 2021)

Multi-agent systems with memories under DoS attacks. - Ricardo Almeida 001; Ewa Girejko; Luís Machado; Agnieszka B. Malinowska; Natália Martins (ICARCV, 2022)

A generalized proportional Caputo fractional model of multi-agent linear dynamic systems via impulsive control protocol. - Martin Bohner; Snezhana G. Hristova; Agnieszka B. Malinowska; Maria Luísa Morgado; Ricardo Almeida 001 (Commun. Nonlinear Sci. Numer. Simul., 2022)

Stability of Gene Regulatory Networks Modeled by Generalized Proportional Caputo Fractional Differential Equations. - Ricardo Almeida 001; Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Entropy, 2022)

A Numerical Scheme for a Generalized Fractional Derivative with Variable Order. - Ricardo Almeida 001 (DIS, 2023)

Editorial for the Special Issue of Axioms "Calculus of Variations, Optimal Control and Mathematical Biology: A Themed Issue Dedicated to Professor Delfim F. M. Torres on the Occasion of His 50th Birthday". - Natália Martins; Ricardo Almeida 001; Cristiana J. Silva; Moulay Rchid Sidi Ammi (Axioms, 2023)

Theoretical Approach to Finite-Time Stability of Switched Fractional-Order Systems. - Ricardo Almeida 001; Ewa Girejko; Luís Machado; Agnieszka B. Malinowska; Natália Martins; Andrzej Ruszewski (MMAR, 2025)

Numerical Approach to Finite-Time Stability of Switched Fractional-Order Systems. - Ricardo Almeida 001; Ewa Girejko; Luís Machado; Agnieszka B. Malinowska; Natália Martins; Andrzej Ruszewski (MMAR, 2025)

On the stability of memory-dependent multi-agent systems under DoS attacks. - Ricardo Almeida 001; Ewa Girejko; Luís Machado; Agnieszka B. Malinowska; Natália Martins (J. Frankl. Inst., 2025)