@article{GDZPPN002089661,
title = {Principal Orbit Types for Algebraic Transformation Spaces in Characteristic Zero.},
journal = {Inventiones mathematicae},
volume = {16},
year = {1972},
pages = {6-14},
zbl = {0242.14010},
url = {http://dml.mathdoc.fr/item/GDZPPN002089661}
}
Richardson, R.W. Jr. Principal Orbit Types for Algebraic Transformation Spaces in Characteristic Zero.. Inventiones mathematicae, Tome 16 (1972) pp. 6-14. http://gdmltest.u-ga.fr/item/GDZPPN002089661/