On Sectional Curvatures of (ε)-Sasakian Manifolds. - Rakesh Kumar; Rachna Rani; Rakesh Kumar Nagaich (Int. J. Math. Math. Sci., 2007)

On CR-Lightlike Product of an Indefinite Kaehler Manifold. - Rakesh Kumar; Jasleen Kaur; Rakesh Kumar Nagaich (Int. J. Math. Math. Sci., 2011)

On GCR-Lightlike Product of Indefinite Cosymplectic Manifolds. - Varun Jain; Rakesh Kumar; Rakesh Kumar Nagaich (Int. J. Math. Math. Sci., 2012)