Zhao Y., and Zhu, H., 2012: Bifurcation of Limit Cycles from a Non-Hamiltonian Quadratic Integrable System with Homoclinic Loop. In "Infinite Dimensional Dynamical Systems", Fields Institute Communications, V. 64. Editors: John Mallet-Paret, Jianhong Wu, Yingfie Yi and Huaiping Zhu.