Assertion: krypton's isotope | /r/HasProperty | ed
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text: He - and 3 H isotope dating of ground water in the Bocholt and Segeberger Forst aquifer systems, in Progress in Hydrogeochemistry, ed. by G. Malthess, F. H. Frimmel, H. D. Schulz, and E. Uschowski, pp. 467-475, Springer-Verlag, Berlin, 1992.