Fedorov, V.E., A.D. Godova, and B.T. Kien. “Integro-Differential Equations With Bounded Operators in Banach Spaces”. Bulletin of the Karaganda University. Mathematics Series 106, no. 2 (June 30, 2022): 93–107. Accessed October 15, 2025. https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/502.