A minimax principle, index of the critical point, and existence of sign-changing solutions to elliptic boundary value problems.
Castro, Alfonso ; Cossio, Jorge ; Neuberger, John M.
Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 1998 (1998), / Harvested from The Electronic Library of Mathematics
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Publié le : 1998-01-01
EUDML-ID : urn:eudml:doc:119620 
@article{01125953,
     title = {A minimax principle, index of the critical point, and existence of sign-changing solutions to elliptic boundary value problems.},
     journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
     volume = {1998},
     year = {1998},
     zbl = {0901.35028},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01125953}
}

Castro, Alfonso; Cossio, Jorge; Neuberger, John M. A minimax principle, index of the critical point, and existence of sign-changing solutions to elliptic boundary value problems.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 1998 (1998) . http://gdmltest.u-ga.fr/item/01125953/