TY  - JOUR
AU  - K. Todorov
TI  - Inverse elements and their average number in a finite symmetric semigroup.
JO  - Semigroup forum
PY  - 1979
SP  - 279
EP  - 281
VL  - 18
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1979__18_134357/
ID  - SF_1979__18_134357
ER  -