J. Llibre, Y. P. Martinez-Mancilla, C. Valls.
Global dynamics of a Lotka-Volterra system in $R^3$.
J. Nonlinear Math. Phys., 27(3), 509-519. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, Y. P. Martinez-Mancilla, C. Vidal.
Limit cycles of a perturbation of a polynomial Hamiltonian systems of degree 4 symmetric with respect to the origin.
Canad. Math. Bull., 63(3), 547-561. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, L. d. A. S. Menezes.
On the limit cycles of a class of discontinuous piecewise linear differential systems.
Discrete Contin. Dyn. Syst. Ser. B, 25(5), 1835-1858. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, M. Messias, A. C. Reinol.
Zero-Hopf bifurcations in three-dimensional chaotic systems with one stable equilibrium.
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 30(12), 2050189. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, A. Murza, C. Valls.
On a conjecture on the integrability of Liénard systems.
Rend. Circ. Mat. Palermo (2), 69, 209-216. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, A. Nabavi, M. Mousavi.
Limit cycles bifurcating from a family of reversible quadratic centers via averaging theory.
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 30(4), 2050051:1-8. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, D. D. Novaes, C. A. B. Rodrigues de Lima.
Bifurcations from families of periodic solutions in piecewise differential systems.
Phys. D, 404, 132342:1-12. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, D. D. Novaes, I. O. Zeli.
Limit cycles of piecewise polynomial perturbations of higher dimensional lineal differential systems.
Rev. Mat. Iberoam., 36(1), . 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, R. D. S. Oliveira, C. A. B. Rodrigues de Lima.
Limit cycles for two classes of control piecewise linear differential systems.
Sao Paulo J. Math. Sci., 1-17. 2020. [DOI]
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J. Llibre, C. Pantazi.
Qualitative study of a model with Rastall gravity.
Classical Quantum Gravity, 37(24), 245010:1-25. 2020. [DOI]
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J. Llibre, W. F. Pereira, C. Pessoa.
Phase portraits of Bernoulli quadratic polynomial differential systems.
Electron. J. Differential Equations, 2020(48), 1-19. 2020.
PreprintAbstractPreprint at DDDUAB

J. Llibre, O. Ramírez.
Gradient systems of harmonic polynomials.
J. Differential Equations, 269, 10073-10084. 2020. [DOI]
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J. Llibre, R. O. Ramírez.
Integrability by separation of variables.
Phys. D, 409, 132523:1-22. 2020. [DOI]
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J. Llibre, R. O. Ramírez, V. Ramírez.
Integrability of a class of N-dimensional Lotka-Volterra and Kolmogorov systems.
J. Differential Equations, 269, 2503-2531. 2020. [DOI]
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J. Llibre, R. O. Ramírez, N. Sadovskaia.
Differential equations with a given set of solutions.
Appl. Math. Comput., 365, 124659:1-20. 2020. [DOI]
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J. Llibre, V. F. Sirvent.
Periods of holomorphic maps on compact Riemann surfaces and product of spheres.
J. Difference Equ. Appl., 26(8), 1059-1066. 2020. [DOI]
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J. Llibre, V. F. Sirvent.
Periodic structure of transversal maps on sum-free products of spheres.
J. Difference Equ. Appl., 25(5), 619-629. 2020. [DOI]
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J. Llibre, D. J. Tonon, M. Q. Velter.
Crossing periodic orbits via first integrals.
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 30(11), 2050163 (9 pages). 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, C. Valls.
Global qualitative dynamics of the brusselator system.
Math. Comput. Simulation, 170, 107-114. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB

J. Llibre, C. Valls.
Centers of planar generalized Abel equations.
J. Differential Equations, 268, 6481-6487. 2020. [DOI]
PreprintAbstractPreprint at DDDUAB