ZERNOV, A. E. On the Solution of a Singular Cauchy Problem for a First-Order Differential Equation Unsolved with Respect to the Derivative of an Unknown Function. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 2, p. 258–262, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4243. Acesso em: 6 dec. 2025.