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@article{MAN_1961__144_160879, author = {R. OSSERMAN}, title = {Hyperbolic surfaces of the form z == f (x, y).}, journal = {Mathematische Annalen}, pages = {77--79}, publisher = {mathdoc}, volume = {144}, year = {1961}, zbl = {0124.29103}, url = {http://geodesic.mathdoc.fr/item/MAN_1961__144_160879/} }
R. OSSERMAN. Hyperbolic surfaces of the form z == f (x, y).. Mathematische Annalen, Tome 144 (1961), pp. 77-79. http://geodesic.mathdoc.fr/item/MAN_1961__144_160879/