%0 Journal Article %A Mariano Giaquinta %A Giuseppe Modica %T The Dirichlet Energy of Mappings with values into the sphere. %J Manuscripta mathematica %D 1989 %P 489-507 %V 65 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155454/ %F MM2_1989__65_3_155454