00713naa#a2200181#i#450# EN\\bibl\130753 20260806194936.4 1994-5655 20260714b2026####ek#y0engy0150####ca RU Testing the fractional dissolution method for ashless concentrates obtained from solid fossil fuels Journal article Syktyvkar FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences" 2026 7 с. Journal article local Очищенные природные продукты немодифицированные. 665.7.032.22 Kuzmin D. V. Burcev I. N. komisc.editorum.ru