@article{PIM_2000_N_S_67_81_a9,
     author = {Marta Dabrowska and Filip Defever and Ryszard Deszcz and Dorota Kowalczyk},
     title = {Semisymmetry and {Ricci-symmetry} for {Hypersurfaces} of {Semi-euclidean} {Spaces}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {103 },
     publisher = {mathdoc},
     volume = {_N_S_67},
     number = {81},
     year = {2000},
     zbl = {0951.53015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_2000_N_S_67_81_a9/}
}