@article{EJDE_1999__1999__a59,
     author = {Chen,  Chao-Nien and Tzeng,  Shyuh-yaur},
     title = {Some properties of {Palais-Smale} sequences with applications to elliptic boundary-value problems},
     journal = {Electronic journal of differential equations},
     year = {1999},
     volume = {1999},
     zbl = {0921.35045},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a59/}
}