@article{MAN_1983__262_163704,
     author = {Katsumi Nomizu and Jun-ichi Hano},
     title = {On {Isometric} {Immersions} of the {Hyperbolic} {Plane} {Into} the {Lorentz-Minkowski} {Space} and the {Monge-Amp\`ere} {Equation} of a {Certain} {Type.}},
     journal = {Mathematische Annalen},
     pages = {245--254},
     publisher = {mathdoc},
     volume = {262},
     year = {1983},
     zbl = {0507.53042},
     url = {http://geodesic.mathdoc.fr/item/MAN_1983__262_163704/}
}