@article{JRAM_1991__417_153323,
     author = {N. Ghoussoub},
     title = {Location, multiplicity and {Morse} indices of min-max critical points.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {27--76},
     publisher = {mathdoc},
     volume = {417},
     year = {1991},
     zbl = {0736.58011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1991__417_153323/}
}