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- [19] CORRELATION BETWEEN TIME OF RAW-MATERIAL FRACTIONS GRINDING AND RAW-MATERIAL SIZE IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA, 1993, 36 (06): : 122 - 124
- [20] INTERNATIONAL RAW-MATERIAL AGREEMENT, PRODUCER ASSOCIATIONS AND THEIR INFLUENCE ON RAW-MATERIAL PRICES IPW BERICHTE, 1984, 13 (03): : 42 - 46