@article{GDZPPN002208520,
title = {Location, multiplicity and Morse indices of min-max critical points.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {416},
year = {1991},
pages = {27-76},
zbl = {0736.58011},
url = {http://dml.mathdoc.fr/item/GDZPPN002208520}
}
Ghoussoub, N. Location, multiplicity and Morse indices of min-max critical points.. Journal für die reine und angewandte Mathematik, Tome 416 (1991) pp. 27-76. http://gdmltest.u-ga.fr/item/GDZPPN002208520/