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Communicated by L. N. Shevrin
The author is grateful to Professors L. N. Shevrin and Ju. N. Maltsev for useful advice.
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Kelarev, A.V. On semigroup graded PI-algebras. Semigroup Forum 47, 294–298 (1993). https://doi.org/10.1007/BF02573766
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DOI: https://doi.org/10.1007/BF02573766