%0 Journal Article %A Graziano Crasta %T A symmetry problem in the calculus of variations %J Journal of the European Mathematical Society %D 2006 %P 139-154 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/41/ %R 10.4171/jems/41 %F JEMS_2006_8_1_a4