TY  - JOUR
AU  - Llibre, Jaume
AU  - Martínez, Paulina
AU  - Vidal, Claudio
TI  - Limit Cycles of a Perturbation of a Polynomial Hamiltonian Systems of Degree 4 Symmetric with Respect to the Origin
JO  - Canadian mathematical bulletin
PY  - 2020
SP  - 547
EP  - 561
VL  - 63
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000626/
DO  - 10.4153/S0008439519000626
ID  - 10_4153_S0008439519000626
ER  -