On the absolute stability  of automatic control systems in the vicinity of a program manifold. Kazakh Mathematical Journal, [S. l.], v. 22, n. 2, p. 37–47, 2024. DOI: 10.70474/d6kew891. Disponível em: https://mathjournal.kz/index.php/kmj/article/view/13. Acesso em: 31 jan. 2025.