M. Alberich-Carramiñana, A. Ferragut, J. Llibre.
Quadratic planar differential systems with algebraic limit cycles via quadratic plane Cremona maps.
Adv. Math., 389, 107924:1-38. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

Ll. Alsedà, S. Borrós.
An algorithm to compute rotation intervals of circle maps.
Commun. Nonlinear Sci. Numer. Simul., 102, 105915:1-18. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

M. E. Anacleto, J. Llibre, C. Valls, C. Vidal.
Limit cycles of discontinuous piecewise differential systems formed by linear centers in $R^2$ and separated by two circles.
Nonlinear Anal. Real World Appl., 60, 103281. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

J. C. Artés, J. Llibre, D. Schlomiuk, N. Vulpe.
Invariant conditions for phase portraits of quadratic systems with complex conjugate invariant lines meeting at a finite point.
Rend. Circ. Mat. Palermo (2), 70(923--945), . 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

J. C. Artés, J. Llibre, D. Schlomiuk, N. Vulpe.
Geometric configurations of singularities of planar polynomial differential systems. A global classification in the quadratic case.
Birkhäuser, 2021.
Link at publisherContents

J. C. Artés, M. C. Mota, A. C. Rezende.
Structurally unstable quadratic vector fields of codimension two: families possessing a finite saddle-node and an infinite saddle-node.
Electron. J. Qual. Theory Differ. Equ., 2021(35), 1-89. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

J. C. Artés, M. C. Mota, A. C. Rezende.
Quadratic differential systems with a finite saddle-node and an infinite saddle-node (1,1) SN - (A).
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 31(2), 2150026 (24 pages). 2021. [DOI] (Preprint)
PreprintAbstractPreprint at DDDUAB

J. C. Artés, M. C. Mota, A. C. Rezende.
Quadratic differential systems with a finite saddle-node and an infinite saddle-node (1,1) SN - (B).
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 31(9), 2130026 (110 pages). 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

J. C. Avila, M. Corbera, M. Frías-Armenta.
Configuration of zeros of isochronous vector fields of degree 5.
J. Complexity, 2021, 6227955. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

W. Aziz, A. Amen, C. Pantazi.
Integrability and linearizability of a family of three-dimensional quadratic systems.
Dyn. Syst., 36(2), 317-331. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

W. Aziz, C. J. Christopher, J. Llibre, C. Pantazi.
Three-dimensional Lotka-Volterra systems with 3:-1:2-resonance.
Mediterranean J. Math., 18, 167:1-24. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

A. Bakhshalizadeh, J. Llibre.
Limit cycles of piecewise differential equations on the cylinder.
Bull. Sci. Math., 170, 103013:1-13. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

K. Banerjee, X. Buff, J. Canela, A. Epstein.
Tips of tongues in the double standard family.
Nonlinearity, 34(12), 8174. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

E. Barrabés, J. M. Cors, A. C. Fernandes, C. Vidal.
Convexity and symmetry of central configurations in the five-body problem: Lagrange plus two.
Qual. Theory Dyn. Syst., 20, 63. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

I. Basak, J. Llibre.
Dynamics of two Einstein-Friedmann cosmological models.
Eur. Phys. J. Plus, 136, 8:1-7. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

J. L. R. Bastos, C. A. Buzzi, J. Torregrosa.
Orbitally symmetric systems with applications to planar centers.
Commun. Pure Appl. Anal., 20(10), 3319-3347. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

A. Belfar, R. Benterki, J. Llibre.
Limit cycles of planar discontinuous piecewise linear Hamiltonian systems without equilibrium points and separated by irreducible cubics.
Dyn. Contin. Discrete Impuls. Syst. Ser. B Appl. Algorithms, 28(6), 399-421. 2021.
PreprintAbstractPreprint at DDDUAB

R. Benterki, J. J. Jimenez Ruiz, J. Llibre.
Limit cycles of planar discontinuous piecewise linear Hamiltonian systems without equilibria separated by reducible cubics.
Electron. J. Qual. Theory Differ. Equ., 2021(69), 1-38. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB

R. Benterki, J. Llibre.
The limit cycles of discontinuous piecewise linear differential systems formed by centers and separated by irreducible cubic curves I.
Dyn. Contin. Discrete Impuls. Syst. Ser A: Math Anal., 28, 153-192. 2021.
PreprintAbstractPreprint at DDDUAB

C. A. Buzzi, Y. R. Carvalho, A. Gasull.
Limit cycles for some families of smooth and non-smooth planar systems.
Nonlinear Anal., 207, 112298:1-13. 2021. [DOI]
PreprintAbstractPreprint at DDDUAB