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- [3] THE PROBLEM OF PRICES OF SECONDARY RAW-MATERIALS POLITICKA EKONOMIE, 1984, 32 (11) : 1147 - 1158
- [4] NARCISSI AS A SOURCE OF RAW-MATERIALS FOR PRODUCING GALANTHAMINUM KHIMIKO-FARMATSEVTICHESKII ZHURNAL, 1989, 23 (05): : 621 - 623
- [6] PROBLEM OF INCREASING EFFECTIVE UTILIZATION OF RAW-MATERIALS KHIMIKO-FARMATSEVTICHESKII ZHURNAL, 1972, 6 (11): : 55 - &
- [7] PROBLEM OF RAW-MATERIALS TO THAT OF TOTAL WORLD RESOURCES MONDES EN DEVELOPPEMENT, 1977, (19): : 499 - 533
- [8] CONSIDERATIONS ON ECOLOGICAL ASPECTS OF RAW-MATERIALS FOR NONIONIC SURFACTANTS FETTE SEIFEN ANSTRICHMITTEL, 1974, 76 (01): : 26 - 27