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- [5] 5TH INTERNATIONAL-SYMPOSIUM ON BIOLOGICAL AND ENVIRONMENTAL REFERENCE MATERIALS (BERM-5) - AACHEN, GERMANY, MAY 11-14, 1992 FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY, 1993, 345 (2-4): : 79 - 80
- [7] 5TH INTERNATIONAL-SYMPOSIUM ON BIOLOGICAL AND ENVIRONMENTAL REFERENCE MATERIALS (BERM-5), AACHEN, GERMANY, 11-14 MAY 1992 CHEMIA ANALITYCZNA, 1993, 38 (02): : 265 - 265