Moldabek Z. Т.; Aldibekov T. М. The uniform lower bound of solutions of nonlinear system of differential equations. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 92, n. 4, p. 46–54, 2018. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/453. Acesso em: 22 jul. 2024.