1.
ELABBASY EM. SINGULAR PERTURBATIONS FOR THE FORCED VAN DER POL OSCILLATOR. Tamkang J. Math. [Internet]. 1993 Dec. 1 [cited 2024 Apr. 26];24(4):417-30. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4514