HU, Huan; SHEN, Jianhe; ZHOU, Zheyan; OU, Zhonghui. Relaxation Oscillations in Singularly Perturbed Generalized Lienard Systems with Non-Generic Turning Points. Mathematical Modelling and Analysis, [S. l.], v. 22, n. 3, p. 389–407, 2017. DOI: 10.3846/13926292.2017.1315344. Disponível em: https://jbem.vilniustech.lt/index.php/MMA/article/view/903. Acesso em: 28 aug. 2025.