TY  - JOUR
AU  - T.S. Blyth
TI  - On middle units in orthodox semigroups.
JO  - Semigroup forum
PY  - 1976
SP  - 261
EP  - 266
VL  - 13
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1976__13_134219/
ID  - SF_1976__13_134219
ER  -