%0 Journal Article %A Michael Wolf %T Harmonic maps form surfaces to R-trees. %J Mathematische Zeitschrift %D 1995 %P 577-594 %V 218 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1995__218_4_174749/ %F MZ_1995__218_4_174749