@article{EJDE_2011__2011__a42,
     author = {Jeanjean,  Louis},
     title = {Some continuation properties via minimax arguments},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1213.35198},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a42/}
}