Bobodzhanova, M.A., B.T. Kalimbetov, and V.F. Safonov. “Singularly Perturbed Integro-Differential Equations With Degenerate Hammerstein’s Kernel”. Bulletin of the Karaganda University. Mathematics Series 116, no. 4 (December 30, 2024): 57–68. Accessed August 29, 2025. http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/739.