M. Grau, J. Llibre, R. M. Ros.
On the periodic orbits of the Contopoulos Hamiltonian.
Lect. Not. Physics, 179, 284-286. 1983.
Abstract

J. Llibre.
El problema 16 de Hilbert: els sistemes quadràtics (Secció problemes i jocs).
Butl. Soc. Catalana Ciénc. Fís. Quím. Mat. (2), 15(1), 54-57. 1983. (In Catalan)
Abstract

J. Llibre.
Problemes i jocs.
Butl. Soc. Catalana Ciénc. Fís. Quím. Mat. (2), 13(1), 14-17. 1983. ((In Catalan))
Abstract

J. Llibre.
A note on the energy levels of Hamiltonian systems of two degrees of freedom.
In Proc. of VI CEDYA, 403-408. Jaca, 1983.
Abstract

J. Llibre, J. Martínez Alfaro.
Órbitas de colisión en el problema restringido espacial de tres cuerpos.
In Proc. of VI CEDYA, 421-424. Jaca, 1983.
Abstract

Ll. Alsedà, J. Llibre.
Minimal periodic orbits.
In IV CEDYA (Sevilla, 1981), 59-68. Univ. Sevilla, Sevilla, 1982.
Abstract

Ll. Alsedà, J. Llibre, R. Serra.
Bifurcations for a circle map family associated with the Van der Pol equation.
In Iteration theory and its applications (Toulouse, 1982), 177-186. CNRS, Paris, 1982.
Abstract

J. Casasayas, J. Llibre.
Invariant manifolds associated to homothetic orbits in the n-body problem.
Indiana Univ. Math. J., 31(4), 463-470. 1982.
Abstract

A. Gasull.
About a family of area preserving aplications.
Masters thesis, Universitat Autònoma de Barcelona, 1982. (In Catalan)
Abstract

J. Llibre.
On the restricted three-body problem when the mass parameter is small.
Celestial Mech., 28(01/02/09), 83-105. 1982.
Abstract

J. Llibre, A. Reventós.
Sur le nombre d'orbites périodiques d'une application continue du cercle en lui-même.
C. R. Acad. Sci. Paris Ser. I Math., 294(1), 51-54. 1982.
Abstract

J. Llibre, A. Reventós.
On the structure of the set of periodic points of a continuous map of the interval with finitely many periodic points.
Arch. Math. (Basel), 39(4), 331-334. 1982.
Abstract

Ll. Alsedà.
Periodic points of continuous mappings of the circle.
Publ. Sec. Mat. Univ. Autònoma Barcelona, 24, 5-71. 1981.
Abstract

Ll. Alsedà, J. Llibre.
Òrbitas minimales periódicas.
In Proc. of IV CEDYA, 59-68. Sevilla, 1981.
Abstract

A. Gasull.
A generalization of the Newton-Raphson method.
Publ. Sec. Mat. Univ. Autònoma Barcelona, 23, 133-138. 1981.
Abstract

G. Gómez, J. Llibre.
A note on a conjecture of Poincaré.
Celestial Mech., 24(4), 335-343. 1981.
Abstract

J. Llibre.
Continuous maps of the circle with finitely many periodic points.
Publ. Sec. Mat. Univ. Autònoma Barcelona, 25, 107-130. 1981.
Abstract

J. Llibre.
Sufficient conditions for a continuous map of $\mathbb R^n$ into itself to have $m$-periodic points for all $m > 0$.
In Nonlinear problems of analysis in geometry and mechanics (Toulouse, 1979), 143-149. Pitman, Boston MA, 1981.
Abstract

J. Llibre.
Sur la stabilité des orbites périodiques d'une application continue du cercle en lui-même avec un nombre fini de points périodiques.
C. R. Acad. Sci. Paris Ser. I Math., 293(6), 335-338. 1981.
Abstract

J. Llibre.
Minimal periodic orbits of continuous mappings of the circle.
Proc. Amer. Math. Soc., 83(3), 625-628. 1981.
Abstract