共 50 条
- [31] RELATIVELY FREE INVERSE-SEMIGROUPS QUARTERLY JOURNAL OF MATHEMATICS, 1986, 37 (147): : 357 - 374
- [35] CONGRUENCE-FREE INVERSE SEMIGROUPS QUARTERLY JOURNAL OF MATHEMATICS, 1974, 25 (100): : 463 - 484
- [38] FREE INVERSE SEMIGROUPS ARE NOT FINITELY PRESENTABLE ACTA MATHEMATICA ACADEMIAE SCIENTIARUM HUNGARICAE, 1975, 26 (1-2): : 41 - 52