TY  - JOUR
AU  - A.Y.W. Lau
TI  - Costability in SEM and TSL.
JO  - Semigroup forum
PY  - 1972
SP  - 370
EP  - 372
VL  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1972__5_133954/
ID  - SF_1972__5_133954
ER  -