YSMAGUL, R.; Zhumartova Б. CHARACTERISTIC FUNCTION OF THE SYSTEM D–EQUATIO. Bulletin of Abai KazNPU. Series of Physical and mathematical sciences, Almaty, Kazakhstan, v. 75, n. 3, p. 29–34, 2021. DOI: 10.51889/2021-3.1728-7901.03. Disponível em: https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/334. Acesso em: 7 apr. 2025.