Sphere packings, lattices, and groups 
Conway, John Horton. 
 - New York :  Springer-Verlag,  1988 
 - xxvii, 663 p. :  ill. ;  24 cm. 
 - Grundlehren der mathematischen Wissenschaften ;  290 .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>038796617X :