References
- Blyth , T.S. 1977 . On middle units in orthodox semigroups . Semigroup Forum , 13 : 261 – 265 .
- Blyth , T.S. and Giraldes , Elíla . 1992 . Perfect elements in Dubreil-Jacotin regular semigroups . Semigroup Forum , 45 : 55 – 62 .
- Blyth , T.S. and Almeida Santos , M.H. 1992 . Naturaliy ordered orthodox Dubreil Jacotin semigroups . Communications in Algebra , 20 : 1167 – 119 .
- Blyth , T.S. and Janowitz , M.F. 1972 . Residuation Theory , Pergamon Press .
- McAlister , D.B. 1981 . Regular Rees matrix semigroups and regular Dubreil-Jacotin semigroups . J. Australian Math. Soc , 31 : 325 – 336 .