Koshanova М.Д, Muratbekova М.А., and Turmetov Б.Х. “SOME BOUNDARY VALUE PROBLEMS WITH INVOLUTION FOR THE NONLOCAL POISSON EQUATION”. Bulletin of Abai KazNPU. Series of Physical and mathematical sciences 71, no. 3 (September 30, 2020): 74–83. Accessed April 4, 2025. https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/32.