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@article{MZ_1995__218_4_174749, author = {Michael Wolf}, title = {Harmonic maps form surfaces to {R-trees.}}, journal = {Mathematische Zeitschrift}, pages = {577--594}, publisher = {mathdoc}, volume = {218}, number = {4}, year = {1995}, zbl = {0827.58011}, url = {http://geodesic.mathdoc.fr/item/MZ_1995__218_4_174749/} }
Michael Wolf. Harmonic maps form surfaces to R-trees.. Mathematische Zeitschrift, Tome 218 (1995) no. 4, pp. 577-594. http://geodesic.mathdoc.fr/item/MZ_1995__218_4_174749/