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![Cover for Krishan L. Duggal · Lightlike Submanifolds of Semi-riemannian Manifolds and Applications - Mathematics and Its Applications (Paperback Book) [Softcover Reprint of the Original 1st Ed. 1996 edition] (2010)](https://imusic.b-cdn.net/images/item/original/789/9789048146789.jpg?krishan-l-duggal-2010-lightlike-submanifolds-of-semi-riemannian-manifolds-and-applications-mathematics-and-its-applications-paperback-book&class=scaled&v=1604970626)
![Cover for Krishan L. Duggal · Differential Geometry of Lightlike Submanifolds - Frontiers in Mathematics (Paperback Book) [2010 edition] (2010)](https://imusic.b-cdn.net/images/item/original/501/9783034602501.jpg?krishan-l-duggal-2010-differential-geometry-of-lightlike-submanifolds-frontiers-in-mathematics-paperback-book&class=scaled&v=1539469342)