Lightlike submanifolds of indefinite Sasakian manifolds. Duggal, K.L.; Sahin, B. — 2007 International Journal of Mathematics and Mathematical Sciences
Semi-invariant submanifolds of Riemannian product manifold. Şahin, B.; Atçeken, M. — 2003 Balkan Journal of Geometry and its Applications (BJGA)
Screen conformal half-lightlike submanifolds. Duggal, K.L.; Sahin, B. — 2004 International Journal of Mathematics and Mathematical Sciences