%0 Journal Article
%A Llibre, Jaume
%A Martínez, Paulina
%A Vidal, Claudio
%T Limit Cycles of a Perturbation of a Polynomial Hamiltonian Systems of Degree 4 Symmetric with Respect to the Origin
%J Canadian mathematical bulletin
%D 2020
%P 547-561
%V 63
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000626/
%R 10.4153/S0008439519000626
%F 10_4153_S0008439519000626