Tarasova, O.A., A.V. Vasilyev, and V.B. Vasilyev. “On Discrete Solutions for Elliptic Pseudo-Differential Equations”. Bulletin of the Karaganda University. Mathematics Series 103, no. 3 (September 30, 2021): 117–123. Accessed July 4, 2025. https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/477.