Құлбек, М., and Э. Джаксигельдинова. 2021. “DETERMINATION AND STUDY OF THE VOLUME AND DENSITY OF COMPLEX POROUS SAMPLES”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences 73 (1). Алматы, Казахстан:110-13. https://doi.org/10.51889/2021-1.1728-7901.16.