@article{PIM_2011_N_S_89_103_a6,
     author = {Abhitosh Upadhyay and Ram Shankar Gupta},
     title = {Semi-parallel {Lightlike} {Hypersurfaces} of {Indefinite} {Cosymplectic} {Space} {Forms}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {69 },
     publisher = {mathdoc},
     volume = {_N_S_89},
     number = {103},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_2011_N_S_89_103_a6/}
}