@article{GDZPPN002443902,
title = {Harmonic maps form surfaces to R-trees.},
journal = {Mathematische Zeitschrift},
volume = {220},
year = {1995},
pages = {577-594},
zbl = {0827.58011},
url = {http://dml.mathdoc.fr/item/GDZPPN002443902}
}
Wolf, Michael. Harmonic maps form surfaces to R-trees.. Mathematische Zeitschrift, Tome 220 (1995) pp. 577-594. http://gdmltest.u-ga.fr/item/GDZPPN002443902/