Zernov, A. E. (2001). 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, 53(2), 258-262. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4243