%0 Journal Article %A Seppo Granlund %T An L...-Estimate for the gradient of extremals. %J Mathematica Scandinavica %D 1982 %P 66-72 %V 50 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1982__50_166782/ %F MS2_1982__50_166782