TY  - JOUR
AU  - F. Knowles
TI  - A characterization of a class of semigroups.
JO  - Semigroup forum
PY  - 1974
SP  - 42
EP  - 49
VL  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1974__6_133958/
ID  - SF_1974__6_133958
ER  -