Quasi Generalized CR-lightlike submanifolds of indefinite nearly   Sasakian manifolds
  In this paper, we introduce and study a new class of CR-lightlike submanifold of an indefinite nearly Sasakian manifold, called Quasi Generalized Cauchy-Riemann (QGCR) lightlike submanifold. We give some characterization theorems for the existence of QGCR-lightlike submanifolds and finally derive necessary and sufficient conditions for some distributions to be integrable. 
Fortun\'e Massamba, Samuel Ssekajja
math.DG