variant. The use of the BCR Reference Material for GT (8 a-c)
as a calibrator ensures numerical comparability of res u lts
between the two methods.
This alternative is seen as a temporary meas u re only until
the patent protection of the carboxylated substrate expires,
i.e. from December 1990 (DE) to December 1993 (AT).
76
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i
Norden 2: supp/, 1990
