@article{00763830,
title = {A unified approach to min-max critical point theorems.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {51},
year = {1994},
pages = {489-516},
zbl = {0831.58014},
language = {en},
url = {http://dml.mathdoc.fr/item/00763830}
}
Ramos, M.; Rebelo, C. A unified approach to min-max critical point theorems.. Portugaliae Mathematica. Nova Série, Tome 51 (1994) pp. 489-516. http://gdmltest.u-ga.fr/item/00763830/