TY  - JOUR
AU  - Keijo Hildén
TI  - Symmetrization of Functions in Sobolev Spaces and The Isoperimetric Inequality.
JO  - Manuscripta mathematica
PY  - 1976
SP  - 215
EP  - 236
VL  - 18
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MM2_1976__18_154387/
ID  - MM2_1976__18_154387
ER  -