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Translated from Matematicheskie Zametki, Vol. 41, No. 4, pp. 469–474, April, 1987.
The author is deeply grateful to S. P. Novikov for the formulation of the problem and assistance with the note.
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Bovdi, A.A. Unitary subgroup of the multiplicative group of the integral group ring of a cyclic group. Mathematical Notes of the Academy of Sciences of the USSR 41, 265–268 (1987). https://doi.org/10.1007/BF01137668
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DOI: https://doi.org/10.1007/BF01137668