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- [5] THE PROBLEM OF PRICES OF SECONDARY RAW-MATERIALS POLITICKA EKONOMIE, 1984, 32 (11) : 1147 - 1158
- [6] FROM RAW-MATERIALS (MINERALS) TO FINISHED PRODUCT JERNKONTORETS ANNALER, 1978, 162 (01): : 28 - 29
- [7] REUSABLE RAW-MATERIALS FROM PLASTICS WASTE ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1975, (169): : 2 - 2
- [10] OBTAINING AND PROCESSING SECONDARY RAW-MATERIALS MICROBIOLOGICALLY CHEMISCHE TECHNIK, 1981, 33 (10): : 533 - 533