00573naa#a2200193#i#450# EN\\bibl\33689 20260110031655.6 1609-3178 20191205b2019####ek#y0engy0150####ca RU Express Assessment of Coal Quality using Domestic X-ray Spectral Analyzer Journal article Saint-Petersburg LLC SVEN 2019 2 с. Journal article local Kudryashov Vladimir I. Moroz Andrey P. Serebryakov Aleksandr S. Mashovets Yury I. zh-szf.ru