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- [22] AN INTERPOLATION PROPERTY FOR SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1970, 17 (01): : 107 - &
- [23] The Bergman property for semigroups JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 2009, 80 : 212 - 232
- [29] SOME COMBINATORIAL PROPERTIES OF FREE SEMIGROUPS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1977, 16 (DEC): : 397 - 402
- [30] COMBINATORIAL PROPERTIES OF PARTIAL TRANSFORMATION SEMIGROUPS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (07): : 1040 - &