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Fresenius' journal of analytical chemistry, 368 (2000) S. 490 - 495
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Fresenius' journal of analytical chemistry, 368 (2000) S. 79 - 87
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Fresenius' journal of analytical chemistry, 368 (2000) S. 23 - 30
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Fresenius' journal of analytical chemistry, 367 (2000) S. 407 - 413