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- [6] PRODUCTION OF REFERENCE MATERIAL - DETERMINATION OF CARBON IN STEELS AND IN PURE IRON IN THE RANGE OF 1 - 100 MU-G/G WITH PRIMARY CALIBRATION FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1987, 327 (5-6): : 456 - 460
- [8] DETERMINATION OF CADMIUM, COPPER, LEAD AND ZINC IN DRINKING-WATER AT THE MU-G/L LEVEL, BY FLAME ATOMIC-ABSORPTION SPECTROPHOTOMETRY REVISTA DE AGROQUIMICA Y TECNOLOGIA DE ALIMENTOS, 1987, 27 (02): : 270 - 278