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The author wishes to express his gratitude to the Alexander-von-Humboldt Stiftung and the University of Alberta who made possible his stay in Edmonton where this paper was written.
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Kleinert, E. On the classnumber of some group rings. Arch. Math 49, 200–207 (1987). https://doi.org/10.1007/BF01271659
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DOI: https://doi.org/10.1007/BF01271659