Fenchel, W.  1905- <br/><br/>
Elementary geometry in hyperbolic space / 
Werner Fenchel. 
 - Berlin ;  New York :  W. de Gruyter,  1989. 
 - xi, 225 p. :  ill. ;  25 cm. 
 - De Gruyter studies in mathematics ; .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0899254934 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry, Hyperbolic.
<br/><br/><label>LC Class. No.: </label>QA685  / .F38 1989