SHALDANBAEV, A. S. Decision singularly perturbed Cauchy problem for systems of ordinary differential equations with variable coefficients method by reject the argument. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 64, n. 1, p. 85–87, 2019. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/600. Acesso em: 22 dec. 2024.