@article{MAN_1955__129_160438,
     author = {K. J\"orgens},
     title = {Harmonische {Abbildungen} und die {Differentialgleichung} rt ? s2 = 1.},
     journal = {Mathematische Annalen},
     pages = {330--344},
     publisher = {mathdoc},
     volume = {129},
     year = {1955},
     zbl = {0064.35203},
     url = {http://geodesic.mathdoc.fr/item/MAN_1955__129_160438/}
}