@article{ARM_2006_42_3_a3,
     author = {Wu, Bing-Ye},
     title = {On the first eigenvalue of spacelike hypersurfaces in {Lorentzian} space},
     journal = {Archivum mathematicum},
     pages = {233--238},
     year = {2006},
     volume = {42},
     number = {3},
     mrnumber = {2260381},
     zbl = {1164.53373},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2006_42_3_a3/}
}