Fenchel, Werner,  1905- <br/><br/>
Discontinuous groups of isometries in the hyperbolic plane / 
Werner Fenchel, Jakob Nielsen ; Ed. by Asmus L. Schmidt. 
 - Berlin ;  New York :  Walter de Gruyter,  2002. 
 - xxi, 364 p. 
 - De Gruyter Studies in Mathematics ;  29 .
<br/><br/>Includes bibliogr. references and index 
<br/><br/><label>ISBN: </label>3110175266 (cloth : alk. paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Discontinuous groups<br/>Isometrics (Mathematics)