(NgEOHIMIQ REDKOZEMELXNYH \LEMENTOW (B/s - (NaLEKSIEW(B, (NeLENs; (NgEOLOGI^ESKIJ INSTITUT bOLGARSKOJ aKADEMII NAUKs ((NsOFIQ (B:s (NiZD(B-(NWO bOLG(B. (NAKAD(B. (NNAUK(B,s, 1974)
Keywords: (NgEOHIMIQs; (NgEOLOGIQs