Samоіlenkо A. M. The numerical-analytical method of investigating periodic systems of ordinary differential equations. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 2, p. 50–59, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8716. Acesso em: 14 apr. 2025.