@article{JRAM_1987__380_152965,
     author = {C.L. Epstein},
     title = {Univalence criteria and surfaces in hyperbolic space.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {196--214},
     publisher = {mathdoc},
     volume = {380},
     year = {1987},
     zbl = {0645.30010},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__380_152965/}
}