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- [38] ANNUAL-MEETING OF THE CHEMICAL-SOCIETY-OF-GDR 29TH NOVEMBER 1ST DECEMBER 1989 IN KARL-MARX-STADT ZEITSCHRIFT FUR CHEMIE, 1990, 30 (04): : 148 - 148
- [39] Labor and energy issues in cement manufacturing from the 1st Cement Industry Technical Conference to the 50th 2008 IEEE CEMENT INDUSTRY TECHNICAL CONFERENCE RECORD, 2008, : 224 - 232
- [40] 1ST ALL-POLISH SCIENTIFIC-TECHNICAL CONFERENCE ON THERMAL-PROCESSING OF GEAR-WHEELS MECHANIK MIESIECZNIK NAUKOWO-TECHNICZNY, 1984, 57 (07): : 375 - 375