Айтжанов, С., А. Қасымбекова, and Г. Жумағул. “SOLVABILITY OF A PSEUDOHYPERBOLIC EQUATION WITH A NONLOCAL BOUNDARY CONDITION”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences, vol. 79, no. 3, Sept. 2022, pp. 14-23, doi:10.51889/6758.2022.35.27.002.