Literature
J. Płonka, Diagonal algebras. Fund. Math.58, 309–320 (1966).
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Herrn Prof. Dr. Reinhold Baer zum 70. Geburtstag
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Płonka, J. R-prime idempotent reducts of groups. Arch. Math 24, 129–132 (1973). https://doi.org/10.1007/BF01228188
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DOI: https://doi.org/10.1007/BF01228188