@article{article04205ee7,
title   = {An estimation for the number of limit cycles in a Liénard-like perturbation of a quadratic nonlinear center},
author = {Martins, Ricardo Miranda and Mereu, Ana Cristina and Oliveira, Regilene Delazari dos Santos},
year = {2015},
doi = {10.1007/s11071-014-1655-z},
journal   = {Nonlinear Dynamics}
}