BALANOV, Z.; SCHWARTZMAN, E. Morse complex, even functionals and asymptotically linear differential equations with resonance at infinity. Topological Methods in Nonlinear Analysis, [S. l.], v. 12, n. 2, p. 323–366, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.045. Acesso em: 22 jul. 2024.