Geodesic
Singular Points of Lightlike Hypersurfaces of the de Sitter Space
Publications de l'Institut Mathématique, _N_S_63 (1998) no. 77, p. 81 .

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We study singular points of lightlike hypersurfaces of the de Sitter space $S^{n+1}_1$ and the geometry of such hypersurfaces and use them for construction of an invariant normalization and an invariant affine connection of lightlike hypersurfaces.
Classification : 53B20 
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     author = {M.A. Akivis and V.V. Goldberg},
     title = {Singular {Points} of {Lightlike} {Hypersurfaces} of the de {Sitter} {Space}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {81 },
     publisher = {mathdoc},
     volume = {_N_S_63},
     number = {77},
     year = {1998},
     zbl = {0949.53015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1998_N_S_63_77_a10/}
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M.A. Akivis; V.V. Goldberg. Singular Points of Lightlike Hypersurfaces of the de Sitter Space. Publications de l'Institut Mathématique, _N_S_63 (1998) no. 77, p. 81 . http://geodesic.mathdoc.fr/item/PIM_1998_N_S_63_77_a10/