@article{IM_1987__89_143478,
     author = {H. Matumoto},
     title = {Whittaker vectors and associated varieties.},
     journal = {Inventiones mathematicae},
     pages = {219--224},
     publisher = {mathdoc},
     volume = {89},
     year = {1987},
     zbl = {0633.17006},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143478/}
}