BUSLAEVA, S. F. On the Poincaré theorem with asymptotically periodic coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 9, p. 1262–1267, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4842. Acesso em: 5 dec. 2025.