Samoilenko AM, Samusenko PF. Asymptotic integration of singularly perturbed differential algebraic equations with turning points. Part I. Ukr. Mat. Zhurn. [Internet]. 2020Dec.24 [cited 2024Nov.21];72(12):1669-81. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/6261