REFERENCES
- Howie , J. M. 1966 . The Subsemigroup Generated by the Idempotents of a Full Transformation Semigroup . J. London Math. Soc. , 41 : 707 – 716 .
- Howie , J. M. 1978 . Idempotent Generators in Finite Full Transformation Semigroups . Proc. Roy. Soc. Edinburgh, Sec. A , 81 : 317 – 323 .
- Gomes , G. M.S. and Howie , J. M. 1987 . On the Rank of Certain Semigroups of Transformations . Math. Proc. Cambridge Philos. Soc. , 101 : 395 – 403 .
- Higgins , P. M. 1992 . Techniques of Semigroup Theory Oxford : Oxford University Press .
- Yang , Xiuliang . 1998 . Non-group Ranks in Finite Full Transformation Semigroups . Semigroup Forum , 57 : 42 – 47 .
- Todorov , K. and Krac¨olova , L. 1985 . On the Maximal Subsemigroups of the Ideals of Finite Symmetric Semigroup, Simon Stevin . 5 : 129 – 140 .
- Yang , Xiuliang . 2000 . A Classification of Maximal Subsemigroups of Order-Preserving Transformation Semigroups . Commun. Algeb. , 28 ( 3 ) : 1503 – 1513 .
- Yang , Xiuliang . 1999 . A Classification of Maximal Inverse Subsemigroups of Finite Symmetric Inverse Semigroups . Commun. Algeb. , 27 ( 8 ) : 4089 – 4096 .
- Berge , C. 1958 . Théorie des graphes et ses applications Paris : Dunod .
- Howie , J. M. and McFadden , R. B. 1990 . Idempotent Rank in Finite Full Semigroups . Proc. Roy. Soc. Edinburgh, Sec. A , 114 : 161 – 167 .