%0 Journal Article
%A Thomas Bartsch
%A Mónica Clapp
%T Bifurcation Theory for Symmetric Potential Operators and the Equvariant Cup-length.
%J Mathematische Zeitschrift
%D 1990
%P 341-356
%V 204
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183775/
%F MZ_1990__204_3_183775