TY  - JOUR
AU  - D. Mittenhuber
TI  - Semigroups in the simply connected  covering of SL(2).
JO  - Semigroup forum
PY  - 1993
SP  - 379
EP  - 387
VL  - 46
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1993__46_1_135244/
ID  - SF_1993__46_1_135244
ER  -