%0 Journal Article
%A A. Raouf Chouikha
%T Monotonicity of the period function for
 some planar differential systems.
 Part I: Conservative and quadratic systems
%J Applicationes Mathematicae
%D 2005
%P 305-325
%V 32
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/am32-3-5/
%R 10.4064/am32-3-5
%G en
%F 10_4064_am32_3_5