[1]
V. S. Rykhlov, “Asymptotics of the system of solutions of a general differential equation with parameter”, Ukr. Mat. Zhurn., vol. 48, no. 1, pp. 96–108, Jan. 1996, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5367