GREBENIKOV, E. A.; CHICHURIN, A. V. Analytic study of some differential equations related to problems of space dynamics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 2, p. 162–171, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3301. Acesso em: 6 dec. 2025.