@article{MAN_1973__205_162488,
     author = {Katsumi Nomizu},
     title = {Isometric {Immersions} of the {Hyperbolic} {Plane} into the {Hyperbolic} {Space.}},
     journal = {Mathematische Annalen},
     pages = {181--192},
     publisher = {mathdoc},
     volume = {205},
     year = {1973},
     zbl = {0256.53042},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__205_162488/}
}