Baimolda D, Cechak T, Shyngysova S. DETERMINATION OF ASH CONTENT IN COAL BY X-RAY FLUORESCENCE ANALYSIS. Phys-Math [Internet]. 2021Mar.29 [cited 2024Nov.22];73(1):82-4. Available from: https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/260