El-Nabulsi, Rami Ahmad, and Waranont Anukool. “Helmholtz and Liénard-Type Oscillators from Non-Standard Lagrangians”. Vietnam Journal of Mechanics 48, no. 1 (March 29, 2026): 1–22. Accessed April 1, 2026. https://vjs.ac.vn/vjmech/article/view/22664.