@article{GDZPPN002112779, title = {Hall algebras, hereditary algebras and quantum groups.}, journal = {Inventiones mathematicae}, volume = {121}, year = {1995}, pages = {361-378}, zbl = {0836.16021}, url = {http://dml.mathdoc.fr/item/GDZPPN002112779} }
Green, James A. Hall algebras, hereditary algebras and quantum groups.. Inventiones mathematicae, Tome 121 (1995) pp. 361-378. http://gdmltest.u-ga.fr/item/GDZPPN002112779/