EL-NABULSI, Rami Ahmad; ANUKOOL, Waranont. Helmholtz and Liénard-type oscillators from non-standard Lagrangians. <b>Vietnam Journal of Mechanics</b>, Hanoi, Vietnam, v. 48, n. 1, p. 1–22, 2026. DOI: 10.15625/0866-7136/22664. Disponível em: https://vjs.ac.vn/vjmech/article/view/22664. Acesso em: 1 apr. 2026.