Encyclopaedia of Mathematical Sciences <br/><br/>
Geometry IV   
Ed. Yu G. Reshetnyak 
 - Berlin  Springer-Verlag  1993 
 - 250p. Bibl. Index. 
 - Encyclopaedia of Mathematical Sciences   V. 70 .
<br/><br/>  
<br/><br/><label>ISBN: </label>3540547010 
<br/><br/><label>Dewey Class. No.: </label>510.3  / En56.70