Anh, Nguyen Dong, and Nguyen Tien Khiem. “Non-Linear Oscillations in First Order Systems With Delay. II. Non-Autonomous Case”. Vietnam Journal of Mechanics 12, no. 3 (September 30, 1990): 1–7. Accessed December 5, 2025. https://vjs.ac.vn/vjmech/article/view/10282.