[1]
N. Kallel and Timoumi М., “Subharmonics of a Nonconvex Noncoercive Hamiltonian System”, Ukr. Mat. Zhurn., vol. 55, no. 11, pp. 1459–1466, Nov. 2003, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4016