@article{GDZPPN002095874, title = {Kostant's Problem, Goldie Rank and the Gelfand-Kirillov Conjecture.}, journal = {Inventiones mathematicae}, volume = {56}, year = {1980}, pages = {191-214}, zbl = {0446.17006}, url = {http://dml.mathdoc.fr/item/GDZPPN002095874} }
Joseph, A. Kostant's Problem, Goldie Rank and the Gelfand-Kirillov Conjecture.. Inventiones mathematicae, Tome 56 (1980) pp. 191-214. http://gdmltest.u-ga.fr/item/GDZPPN002095874/