1.
Yakovets VP. Asymptotics of the general solution to a linear singularly perturbed system of second-order differential equations with degeneracy. Ukr. Mat. Zhurn. [Internet]. 1993 Apr. 25 [cited 2025 Dec. 5];45(4):561–575. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5843