@article{BMMS_1999_22_2_a7,
     author = {U.C. De and Absos Ali Shaikh},
     title = {Non-Existence of {Proper} {Semi-Invariant
}                        {Submanifolds} of a {Lorentzian} {Para-Sasakian} {Manifold}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {1999},
     volume = {22},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_1999_22_2_a7/}
}