References
- Higgins , P. M. 1992 . Techniques of Semigroup Theory Oxford University Press .
- Howie , J. M. 1995 . Fundamentals of Semigroup Theory Oxford : Clarendon Press .
- Levi , I. , McAlister , D. B. and McFadden , R. B. 2000 . Groups associated with finite transformation semigroups . Semigroup Forum , 61 : 453 – 467 .
- McAlister , D. B. 1997 . “ Semigroup for windows ” . PC Software
- McAlister , D. B. 1998 . Semigroups generated by a group and an idempotent . Comm. Algebra , 26 : 515 – 547 .
- #Communicated by P. Higgins.