1.
Kallel N, Timoumi М. Subharmonics of a Nonconvex Noncoercive Hamiltonian System. Ukr. Mat. Zhurn. [Internet]. 2003 Nov. 25 [cited 2025 Dec. 6];55(11):1459-66. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4016