Yasar, Erol, A. Ceylan Cöken, and Ahmet Yücesan. “Lightlike Hypersurfaces in Semi-Riemannian Manifold With Semi-Symmetric Non-Metric Connection”. MATHEMATICA SCANDINAVICA 102, no. 2 (June 1, 2008): 253–264. Accessed May 6, 2024. https://www.mscand.dk/article/view/15061.