ZALEWSKI, M. Computer-assisted proof of a periodic solution in a nonlinear feedback DDE. Topological Methods in Nonlinear Analysis, [S. l.], v. 33, n. 2, p. 373–393, 2009. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2009.025. Acesso em: 3 jul. 2024.