Duggal, Krishan L. <br/><br/>
Lightlike submanifolds of semi-riemannian manifolds and applications   
by Duggal, Krishnan L and Bejancu, Aurel 
 - Dordrecht  Kluwer Academic Pub.  1996 
 - viii, 300p. 
 - Mathematics and its applications  Vol.364 .
<br/><br/><label>ISBN: </label>0792339576 
<br/><br/><label>Dewey Class. No.: </label>516.362  / N96