TY  - JOUR
AU  - R.J. Warne
TI  - On the structure of semigroups which are unions of groups.
JO  - Semigroup forum
PY  - 1972
SP  - 323
EP  - 330
VL  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1972__5_133949/
ID  - SF_1972__5_133949
ER  -