KOROLYUK, V. S. Singularly perturbed stochastic systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 1, p. 25–34, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4984. Acesso em: 5 dec. 2025.