Akivis, Maks A. and Goldberg, Vladislav V. <br/><br/>
Differential geometry of varieties with degenerate gauss maps   

 - New York  Springer-Verlag  2004 
 - xxi, 255p. Bibl. Index. 
 - CMS books in Mathematics    v.18 .
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<br/><br/><label>ISBN: </label>0387404635 
<br/><br/><label>Dewey Class. No.: </label>516  / Ak315.DG