TY  - JOUR
AU  - Claus Michael Ringel
TI  - Hall algebras and quantum groups.
JO  - Inventiones mathematicae
PY  - 1990
SP  - 583
EP  - 592
VL  - 101
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1990__101_2_143817/
ID  - IM_1990__101_2_143817
ER  -