@article{MAN_1979__242_163283,
     author = {David A. jr. Vogan},
     title = {A {Generalized} {...-Invariant} for the {Primitive} {Spectrum} of a {Semisimple} {Lie}  {Algebra.}},
     journal = {Mathematische Annalen},
     pages = {209--224},
     publisher = {mathdoc},
     volume = {242},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/MAN_1979__242_163283/}
}