%0 Journal Article %A Donato Passaseo %T Multiplicity of positive solutions of nonlinear elliptic equations with critical sobolev exponent in some contractible domains. %J Manuscripta mathematica %D 1989 %P 147-166 %V 65 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155431/ %F MM2_1989__65_3_155431