(NpOWY[ENIE \FFEKTIWNOSTI GORNOJ PROMY[LENNOSTI qKUTII (B/s - (NiWANOW(B, (Nn(B. (Ns(B.s ((NnOWOSIBIRSK (B:s (NnAUKA(B,s, 1974)
Keywords: (NgORNAQ PROMY[LENNOSTX qKUTII (B- (NiSSLEDOWANIQs