@article{MAN_1985__270_182951,
     author = {Barbara Tabak},
     title = {A {Geometric} {Characterization} of {Harmonic} {Diffeomorphisms} {Between} {Surfaces.}},
     journal = {Mathematische Annalen},
     pages = {147--158},
     publisher = {mathdoc},
     volume = {270},
     year = {1985},
     zbl = {0536.53043},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__270_182951/}
}