Isochronicity into a family of time-reversible cubic vector fields. - Javier Chavarriga; Isaac A. García; Jaume Giné (Appl. Math. Comput., 2001)

On Integrability of differential equations Defined by the Sum of Homogeneous Vector Fields with degenerate infinity. - Javier Chavarriga; Isaac A. García; Jaume Giné (Int. J. Bifurc. Chaos, 2001)

On a Result of Darboux. - Javier Chavarriga; Jaume Llibre; Jean Moulin Ollagnier (LMS J. Comput. Math., 2001)

Analytic integrability of a class of nilpotent cubic systems. - Javier Chavarriga; Jaume Giné; J. Sorolla (Math. Comput. Simul., 2002)

Invariant algebraic curves linear in one variable for planar real quadratic systems. - Javier Chavarriga; Maite Grau (Appl. Math. Comput., 2003)

A family of non-darboux-integrable quadratic polynomial differential systems with algebraic solutions of arbitrarily high degree. - Javier Chavarriga; Maite Grau (Appl. Math. Lett., 2003)