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- [8] MACROPETROGRAPHICAL ANALYSIS OF SOFT BROWN COAL .2. RECOMMENDATION OF AN INTERNATIONAL SYSTEM OF CLASSIFICATION OF SOFT BROWN COALS ZEITSCHRIFT FUR ANGEWANDTE GEOLOGIE, 1976, 22 (07): : 313 - 319
- [10] Project of International classification of low, medium and high rank coals Elektrotekh, 6 (3-12):