Нуруллаев, Н.М, Д.А Тургунбоев, and Е.Н Жолдасов. 2021. “EVALUATION OF POSSIBILITIES TO IMPROVE RIGID BODIES”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences 69 (1). Алматы, Казахстан:392-95. https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/238.