J. Llibre, P. Mumbrú.
Extending the *-product operator.
In European Conference on Iteration Theory (Batschuns, 1989), 199-214. World Sci. Publishing, River Edge NJ, 1991.
Abstract

J. Llibre, P. Mumbrú.
On sizes and shapes of lattice figures.
Internat. J. Math. Ed. Sci. Tech., 22(3), 365-386. 1991.
Abstract

A. Nunes, J. Casasayas, J. Llibre.
A perturbation of the relativistic Kepler problem.
In Predictability, stability, and chaos in n-body dynamical systems (Cortina d'Ampezzo, 1990), 547-554. Plenum, New York, 1991.
Abstract

Ll. Alsedà, F. Mañosas.
Kneading theory and rotation intervals for a class of circle maps of degree one.
Nonlinearity, 3(2), 413-452. 1990.
Abstract

C. Alsina, J. Llibre.
On the length, area and volume of lattice figures.
Rad. Mat., 6(1), 177-180. 1990.
Abstract

J. C. Artés.
Quadratic differential systems.
PhD thesis, Universitat Autònoma de Barcelona, 1990.
Abstract

A. Cima, J. Llibre.
Algebraic and topological classification of the homogeneous cubic vector fields in the plane.
J. Math. Anal. Appl., 147(2), 420-448. 1990.
Abstract

A. Cima, J. Llibre.
Bounded polynomial vector fields.
Trans. Amer. Math. Soc., 318(2), 557-579. 1990.
Abstract

B. Coll, J. Llibre.
Limit cycles for a quadratic system with an invariant straight line and some evolution of phase portraits.
In Qualitative theory of differential equations (Szeged, 1988), 111-123. North-Holland, Amsterdam, 1990.
Abstract

A. Gasull, J. Llibre.
Limit cycles for a class of Abel equations.
SIAM J. Math. Anal., 21(5), 1235-1244. 1990.
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A. Gasull, J. Sotomayor.
On the basin of attraction of dissipative planar vector fields.
In Bifurcations of planar vector fields (Luminy, 1989), 187-195. Springer, Berlin, 1990.
Abstract

A. Gasull, E. Ventura.
Secció problemes i jocs.
Butl. Soc. Catalana Mat., 5, 74-77. 1990. (In Catalan)
Abstract

J. Llibre, R. S. MacKay.
A classification of braid types for diffeomorphisms of surfaces of genus zero with topological entropy zero.
J. London Math. Soc. (2), 42(3), 562-576. 1990.
Abstract

J. Llibre, C. Piñol.
On the elliptic restricted three-body problem.
Celestial Mech. Dynam. Astronom., 48(4), 319-345. 1990.
Abstract

F. Mañosas.
Symbolic dynamics for degree one circle maps.
PhD thesis, Universitat Autònoma de Barcelona, 1990.
Abstract

Ll. Alsedà, A. Falcó.
The bifurcations of a piecewise monotone family of circle maps related to the Van der Pol equation.
In European Conference on Iteration Theory (Caldes de Malavella, 1987), 113-120. World Sci. Publishing, Teaneck NJ, 1989.
Abstract

Ll. Alsedà, J. Llibre.
Kneading theory of Lorenz maps.
In Dynamical systems and ergodic theory (Warsaw, 1986), 83-89. PWN, Warsaw, 1989.
Abstract

Ll. Alsedà, J. Llibre, F. Mañosas, M. Misiurewicz.
Topological entropy for circle maps of degree one.
In European Conference on Iteration Theory (Caldes de Malavella, 1987), 382-391. World Sci. Publishing, Teaneck NJ, 1989.
Abstract

Ll. Alsedà, J. Llibre, M. Misiurewicz.
Periodic orbits of maps of Y.
Trans. Amer. Math. Soc., 313(2), 475-538. 1989.
Abstract

Ll. Alsedà, J. Llibre, M. Misiurewicz, C. Tresser.
Periods and entropy for Lorenz-like maps.
Ann. Inst. Fourier (Grenoble), 39(4), 929-952. 1989.
Abstract