X. Jarque, J. Villadelprat.
Nonexistence of isochronous centers in planar polynomial Hamiltonian systems of degree four.
J. Differential Equations, 180(2), 334-373. 2002. [DOI]
Abstract

X. Jarque, J. Villadelprat.
On the period function of centers in planar polynomial Hamiltonian systems of degree four.
Qual. Theory Dyn. Syst., 3(1), 157-180. 2002. [DOI]
Abstract

D. Juher, J. Gelabertó.
Paradoxes i problemes clàssics de geometria integral.
Butl. Soc. Catalana Mat., 17(1), 79-91. 2002.
Abstract

E. A. Lacomba, J. Llibre, E. Pérez-Chavela.
The generalized Sitnikov problem.
In Celestial mechanics (Evanston, IL, 1999). Contemporary Mathematics, 147-158. Amer. Math. Soc., Providence, RI, 2002. [DOI]
Abstract

C. Li, W. Li, J. Llibre, Z. Zhang.
Linear estimation of the number of zeros of Abelian integrals for some cubic isochronous centers.
J. Differential Equations, 180(2), 307-333. 2002. [DOI]
Abstract

W. Li, J. Llibre, M. Nicolau, X. Zhang.
On the differentiability of first integrals of two dimensional flows.
Proc. Amer. Math. Soc., 130(7), 2079-2088. 2002. [DOI]
Abstract

W. Li, J. Llibre, X. Zhang.
Extension of Floquet's theory to nonlinear periodic differential systems and embedding diffeomorphisms in differential flows.
Amer. J. Math., 124(1), 107-127. 2002.
Abstract

J. Llibre.
Averaging theory and limit cycles for quadratic systems.
Rad. Mat., 11, 215-228. 2002.
Abstract

J. Llibre.
Orbites periòdiques dels sistemes Hamiltonians amb 2 graus de llibertat via homeomorfismes de superfície.
Mem. Real Acad. Cienc. Artes Barcelona, LX, 1-29. 2002.
Abstract

J. Llibre.
Una reflexió sobre el racó de l'univers on vivem i la seva relació amb un instant crucial de la història de la ciència.
In Actas de VI trobada de la història de la ciència i de la tècnica, 65-71. 2002.
Abstract

J. Llibre, E. Nuñez, A. E. Teruel.
Limit cycles for planar piecewise linear differential systems via first integrals.
Qual. Theory Dyn. Syst., 3(1), 29-50. 2002. [DOI]
Abstract

J. Llibre, E. Piña.
Saari's conjecture holds for the planar 3-body problem.
2002.
Abstract

J. Llibre, G. Rodríguez.
Darbouxian integrability of polynomial vector fields with special emphasis on the two-dimensional surfaces.
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 12(12), 2821-2833. 2002. [DOI]
Abstract

J. Llibre, A. Sá.
Minimal set of periods for continuous self-maps of a bouquet of circles.
2002.
Abstract

J. Llibre, J. Sotomayor, M. Zhitomirskii.
Impasse bifurcations of constrained systems.
In Differential equations and dynamical systems (Lisbon, 2000), 235-255. Amer. Math. Soc., Providence, RI, 2002.
Abstract

J. Llibre, X. Zhang.
Darboux integrability for the Rossler system.
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 12(2), 421-428. 2002. [DOI]
Abstract

J. Llibre, X. Zhang.
Darboux integrability of real polynomial vector fields on regular algebraic hypersurfaces.
Rend. Circ. Mat. Palermo (2), 51(1), 109-126. 2002. [DOI]
Abstract

J. Llibre, X. Zhang.
Invariant algebraic surfaces of the Lorenz system.
J. Math. Phys., 43(3), 1622-1645. 2002. [DOI]
Abstract

J. Llibre, X. Zhang.
Polynomial first integrals for quasi-homogeneous polynomial differential systems.
Nonlinearity, 15(4), 1269-1280. 2002. [DOI]
Abstract

V. Mañosa.
On the center problem for degenerate singular points of planar vector fields.
Internat. J. Bifur. Chaos Appl. Sci. Engrg., 12(4), 687-707. 2002.
Abstract