TUNGATAROV, A.; AKHMED-ZAKI, D. K. Cauchy problem for one class of second order ordinary differential equations. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 70, n. 3, p. 31–35, 2011. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/206. Acesso em: 16 oct. 2024.