Baimolda, D, T. Cechak, and Sh. Shyngysova. 2021. “DETERMINATION OF ASH CONTENT IN COAL BY X-RAY FLUORESCENCE ANALYSIS”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences 73 (1). Алматы, Казахстан:82-84. https://doi.org/10.51889/2021-1.1728-7901.11.