@article{IM_1980__56_142695,
     author = {A. Joseph},
     title = {Kostant's {Problem,} {Goldie} {Rank} and the {Gelfand-Kirillov} {Conjecture.}},
     journal = {Inventiones mathematicae},
     pages = {191--214},
     publisher = {mathdoc},
     volume = {56},
     year = {1980},
     zbl = {0446.17006},
     url = {http://geodesic.mathdoc.fr/item/IM_1980__56_142695/}
}