SAMOILENKO , A. M.; SAMUSENKO , P. F. Asymptotic integration of singularly perturbed differential-algebraic equations with turning points. II. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 73, n. 6, p. 849–864, 2021. DOI: 10.37863/umzh.v73i6.6260. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6260. Acesso em: 5 dec. 2025.