MA, Tiantian; YANG, Congmin; WANG, Zaihong. Periodic solutions of singular Duffing equations under one-sided Lipschitz condition. Topological Methods in Nonlinear Analysis, [S. l.], p. 1–20, 2025. DOI: 10.12775/TMNA.2024.030. Disponível em: https://apcz.umk.pl/TMNA/article/view/58856. Acesso em: 3 mar. 2025.