@article{GDZPPN002309521,
title = {Principal Orbit Types for Reductive Groups Acting on Stein Manifolds.},
journal = {Mathematische Annalen},
volume = {212},
year = {1974},
pages = {323-332},
zbl = {0267.32015},
url = {http://dml.mathdoc.fr/item/GDZPPN002309521}
}
Richardson, R.W. jr. Principal Orbit Types for Reductive Groups Acting on Stein Manifolds.. Mathematische Annalen, Tome 212 (1974) pp. 323-332. http://gdmltest.u-ga.fr/item/GDZPPN002309521/