KLUN, Giuliano; SFECCI, Andrea. Well-ordered and non-well-ordered lower and upper solutions for periodic 2N-dimensional systems. Topological Methods in Nonlinear Analysis, [S. l.], v. 65, n. 1, p. 177–202, 2025. DOI: 10.12775/TMNA.2024.026. Disponível em: https://apcz.umk.pl/TMNA/article/view/59306. Acesso em: 28 jun. 2025.