TY  - JOUR
AU  - J.P. Troallic
AU  - G. Hansel
TI  - Extension properties  of WS-groups.
JO  - Semigroup forum
PY  - 1992
SP  - 63
EP  - 70
VL  - 45
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1992__45_3_135172/
ID  - SF_1992__45_3_135172
ER  -