@article{MAN_1974__208_162578,
     author = {R.W. jr. Richardson},
     title = {Principal {Orbit} {Types} for {Reductive} {Groups} {Acting} on {Stein} {Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {323--332},
     publisher = {mathdoc},
     volume = {208},
     year = {1974},
     zbl = {0267.32015},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__208_162578/}
}