@article{GDZPPN002210444,
title = {Quotient spaces and critical points of invariant functions for C*-actions.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {435},
year = {1993},
pages = {55-100},
zbl = {0767.32008},
url = {http://dml.mathdoc.fr/item/GDZPPN002210444}
}
Montaldi, James; Straten, Duco van. Quotient spaces and critical points of invariant functions for C*-actions.. Journal für die reine und angewandte Mathematik, Tome 435 (1993) pp. 55-100. http://gdmltest.u-ga.fr/item/GDZPPN002210444/