@article{JRAM_1997__489_153935,
     author = {Y.L. Xin and Rugang Ye},
     title = {Bernstein-type theorems for space-like surfaces with parallel mean curvature.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {189--198},
     publisher = {mathdoc},
     volume = {489},
     year = {1997},
     zbl = {0879.53046},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1997__489_153935/}
}