Hu H, Shen J, Zhou Z, Ou Z. Relaxation Oscillations in Singularly Perturbed Generalized Lienard Systems with Non-Generic Turning Points. MMA [Internet]. 2017May19 [cited 2024Nov.25];22(3):389-407. Available from: https://gc.vgtu.lt/index.php/MMA/article/view/903