PISARENKO, V. G. Construction of some solutions of the Couchy generalized problem for ordinary non-linear differential equations . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 4, p. 553–559, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8592. Acesso em: 6 dec. 2025.