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- [3] SEMIGROUPS OF FILTER ENDOMORPHISMS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 1982, (01): : 71 - 74
- [6] RESIDUALLY FINITE SEMIGROUPS OF ENDOMORPHISMS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 16 (06): : 965 - &
- [7] RESIDUALLY FINITE SEMIGROUPS OF ENDOMORPHISMS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY, 1970, 2 (OCT): : 719 - +