Geometry II  Spaces of constant curvature 
ed. by Ernest Borisovich Vinberg 
 - Berlin  Springer-Verlag  1993 
 - 254p. 
 - Encyclopaedia of mathematical sciences  V.29 .
<br/><br/><label>ISBN: </label>3540520007 
<br/><br/><label>Dewey Class. No.: </label>516.36  / N91.2