K. A. Kasymov and . D. N. Nurgabyl, “Asymptotic Behavior of Solutions of Linear Singularly Perturbed General Separated Boundary-Value Problems with Initial Jump”, Ukr. Mat. Zhurn., vol. 55, no. 11, pp. 1476–1488, Nov. 2003, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4018