ANDRES, J. Further remarks on a problem of Moser and a conjecture of Mawhin. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 1, p. 163–174, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.038. Acesso em: 18 apr. 2024.