%0 Journal Article
%A Keijo Hildén
%T Symmetrization of Functions in Sobolev Spaces and The Isoperimetric Inequality.
%J Manuscripta mathematica
%D 1976
%P 215-236
%V 18
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1976__18_154387/
%F MM2_1976__18_154387