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@article{IM_1990__101_2_143817, author = {Claus Michael Ringel}, title = {Hall algebras and quantum groups.}, journal = {Inventiones mathematicae}, pages = {583--592}, publisher = {mathdoc}, volume = {101}, number = {2}, year = {1990}, zbl = {0735.16009}, url = {http://geodesic.mathdoc.fr/item/IM_1990__101_2_143817/} }
Claus Michael Ringel. Hall algebras and quantum groups.. Inventiones mathematicae, Tome 101 (1990) no. 2, pp. 583-592. http://geodesic.mathdoc.fr/item/IM_1990__101_2_143817/