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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 18, No. 4, pp. 861–876, July–August, 1977.
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Roomel'di, R.É. Centers of a free (−1, 1) ring. Sib Math J 18, 610–622 (1977). https://doi.org/10.1007/BF00967203
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DOI: https://doi.org/10.1007/BF00967203