PROCEDURE FOR WEAKENING MARGINAL MASSIF OF MINE WORKINGS AT DEVELOPMENT OF COAL BEDS von V'JUNIKOV ALEKSANDR ANATOL'EVICH, KOZULIN VASILIJ VLADIMIROVICH, GUSEL'NIKOV LEV MITROFANOVICH, KOVAL' ANDREJ OLEGOVICH, OSIPOV ANATOLIJ NIKOLAEVICH, PODOSENOV ALEKSANDR ALEKSANDROVICH

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