KHACHNAOUI, Khaled. Existence and multiplicity of solutions for a class of Hamiltonian systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 76, n. 6, p. 915–930, 2024. DOI: 10.3842/umzh.v76i5.7497. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7497. Acesso em: 5 dec. 2025.