Limit cycles bifurcating from a quadratic reversible Lotka-Volterra system with a center and three saddles

Existence of Generalized Homoclinic Solutions of Lotka-Volterra System under a Small Perturbation

“…The bifurcation structures are given by Kan [10]. Limit cycles bifurcations were discussed by Wu and Liang [11]. The cyclicity of period annulus was analyzed in Li and Llibre [12].…”