[1]
A. M. Samoilenko, “Some problems of the linear theory of systems of ordinary differential equations”, Ukr. Mat. Zhurn., vol. 63, no. 2, pp. 237–269, Feb. 2011, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2714