SIEMASZKO, A.; SZYMAŃSKI, J. On exact topological flows. Topological Methods in Nonlinear Analysis, [S. l.], v. 21, n. 2, p. 387–392, 2003. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2003.024. Acesso em: 22 jul. 2024.