Yeshkeyev, A., O. Ulbrikht, and A. Koshekova. “PROPERTIES OF CATEGORICITY FOR KAISER CLASS”. Bulletin of Abai KazNPU. Series of Physical and Mathematical sciences 91, no. 3 (September 27, 2025): 29–42. Accessed May 8, 2026. https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/2263.