BOLSINOV, A. V.; OSHEMKOV, A. A.; SHARKO, V. V. On classification of flows on manifolds. I. Methods of Functional Analysis and Topology, [S. l.], v. 2, n. 2, p. 51–60, 1996. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/12. Acesso em: 19 dec. 2025.