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    Half-lightlike submanifolds with planar normal sections in R24
    (Tubitak Scientific & Technological Research Council Turkey, 2014) Erdogan, Feyza Esra; Gunes, Rifat; Sahin, Bayram
    We investigate half-lightlike submanifolds with planar normal sections of 4-dimensional pseudo-Euclidean space. We obtain necessary and sufficient conditions for a half-lightlike submanifold of R-2(4) such that it has degenerate or nondegenerate planar normal sections.
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    LIGHTLIKE SURFACES WITH PLANAR NORMAL SECTIONS IN MINKOWSKI 3-SPACE
    (Int Electronic Journal Geometry, 2014) Erdogan, Feyza Esra; Sabin, Bayram; Gunes, Rifat
    In this paper we study lightlike surfaces of Minkowski 3- space such that they have degenerate or non-degenerate planar normal sections. We first show that every lightlike surface of Minkowski 3- space has degenerate planar normal sections. Then we study lightlike surfaces with non-degenerate planar normal sections and obtain a characterization for such lightlike surfaces.