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M. HALONEN AND L. HALONEN, Laboratory of Physical Chemistry, P. O. Box 55 (A. I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland; H. BÜRGER AND W. JERZEMBECK, FB9-Anorganische Chemie, Universität-GH Wuppertal, D-42097 Wuppertal, Germany.
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