ПОКУТНИЙ, О. О. Syngularly perturbed nonlinear systems. Technology audit and production reserves, [S. l.], v. 5, n. 2(7), p. 37–38, 2012. DOI: 10.15587/2312-8372.2012.4838. Disponível em: https://journals.uran.ua/tarp/article/view/4838. Acesso em: 23 nov. 2024.