@article{GDZPPN002107759, title = {Hall algebras and quantum groups.}, journal = {Inventiones mathematicae}, volume = {100}, year = {1990}, pages = {583-592}, zbl = {0735.16009}, url = {http://dml.mathdoc.fr/item/GDZPPN002107759} }
Ringel, Claus Michael. Hall algebras and quantum groups.. Inventiones mathematicae, Tome 100 (1990) pp. 583-592. http://gdmltest.u-ga.fr/item/GDZPPN002107759/