[1]
Zadiraka К. V. and Lоs G. A., “On the stability and instability of solutions of linear differential equations of the $n$th order with periodic coefficients”, Ukr. Mat. Zhurn., vol. 18, no. 6, pp. 117–122, Oct. 1966, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8467