Space time manifolds and contact structures. Duggal, K.L. — 1990 International Journal of Mathematics and Mathematical Sciences
Totally umbilical CR-submanifolds of semi-Riemannian Kähler manifolds. Duggal, K.L.; Sharma, R. — 1987 International Journal of Mathematics and Mathematical Sciences
Lightlike submanifolds of indefinite Sasakian manifolds. Duggal, K.L.; Sahin, B. — 2007 International Journal of Mathematics and Mathematical Sciences
Screen conformal half-lightlike submanifolds. Duggal, K.L.; Sahin, B. — 2004 International Journal of Mathematics and Mathematical Sciences
Hypersurfaces in a conformally flat space with curvature collineation. Duggal, K.L.; Sharma, R. — 1991 International Journal of Mathematics and Mathematical Sciences
Real hypersurfaces of indefinite Kähler manifolds. Bejancu, A.; Duggal, K.L. — 1993 International Journal of Mathematics and Mathematical Sciences