A singular Cauchy problem for an ordinary differential equation not solved with respect to the derivative of the unknown function. Neliniini Kolyvannya, [S. l.], v. 20, n. 2, p. 166–183, 2017. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/862. Acesso em: 8 dec. 2025.