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- [1] PURIFYING QUARTZ RAW MATERIAL BY ELECTROSTATIC SEPARATION. Glass and Ceramics (English translation of Steklo i Keramika), 1980, 37 (5-6): : 283 - 286
- [5] GROWTH OF PIEZOELECTRIC QUARTZ CRYSTALS OF A NEW TYPE OF RAW-MATERIAL DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1982, 35 (06): : 761 - 763
- [9] POTENTIAL RAW-MATERIAL FOR PRODUCING HIGH-GRADE QUARTZ GLASS ZEITSCHRIFT FUR ANGEWANDTE GEOLOGIE, 1974, 20 (08): : 370 - 373