Asymptotic integration of singularly perturbed systems of parabolic type partial differential equations with degenerations. Neliniini Kolyvannya, [S. l.], v. 15, n. 2, p. 244–257, 2012. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/649. Acesso em: 21 jan. 2026.