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- [3] PREPARATION OF CALIBRATION STANDARDS BY CHARGING ADSORPTION TUBES WITH MULTI-COMPOUND TEST GASES FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1989, 334 (07): : 666 - 666
- [4] STANDARDS USED IN THE TRACE ANALYSIS OF SELECTED GASES INTERNATIONAL LABORATORY, 1981, 11 (01): : 61 - &