TUNGATAROV, A. B. Cauchy problem for class of second order nonlinear ordinary differential equations. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 76, n. 1, p. 22–28, 2013. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/83. Acesso em: 3 jul. 2024.