@article{ARM_2010__46_2_a1,
     author = {Shu, Shichang},
     title = {Hypersurfaces with constant $k$-th mean curvature in a {Lorentzian} space form},
     journal = {Archivum mathematicum},
     pages = {87--97},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2010},
     mrnumber = {2684251},
     zbl = {1240.53101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2010__46_2_a1/}
}