SAMOILENKO, A. M.; TEPLINSKY, Yu. V. On decomposability of countable systems of differential equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 10, p. 1424–1432, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5947. Acesso em: 14 apr. 2025.