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Mathematics Institute, Computer Center, Academy of Sciences of the Tajanian SSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 21, No. 1, pp. 86–87, January–March, 1987.
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Faiziev, V.A. Pseudocharacters on free products of semigroups. Funct Anal Its Appl 21, 77–79 (1987). https://doi.org/10.1007/BF01077996
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DOI: https://doi.org/10.1007/BF01077996