TY  - JOUR
AU  - P. Normak
TI  - Purity in the category of M-sets.
JO  - Semigroup forum
PY  - 1980
SP  - 157
EP  - 170
VL  - 20
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1980__20_134412/
ID  - SF_1980__20_134412
ER  -