Bakanov, G.B., and S.K. Meldebekova. “On the Stability of the Difference Analogue of the Boundary Value Problem for a Mixed Type Equation”. Bulletin of the Karaganda University. Mathematics Series 105, no. 1 (March 30, 2022): 35–42. Accessed December 8, 2025. https://mts.buketov.edu.kz/mathematics-vestnik/article/view/461.