@article{GDZPPN00206815X,
title = {On the Gauss image of a spacelike hypersurface with constant mean curvature in Minkowski space.},
journal = {Commentarii mathematici Helvetici},
volume = {66},
year = {1991},
pages = {590-598},
zbl = {0752.53038},
url = {http://dml.mathdoc.fr/item/GDZPPN00206815X}
}
Xin, Y.L. On the Gauss image of a spacelike hypersurface with constant mean curvature in Minkowski space.. Commentarii mathematici Helvetici, Tome 66 (1991) pp. 590-598. http://gdmltest.u-ga.fr/item/GDZPPN00206815X/