Iversen, Birger <br/><br/>
Hyperbolic geometry / 

 - Cambridge:  Cambridge University Press,  1992 
 - xiv, 293p. Index. Bibl. 
 - London Mathematical Society student texts  v. 25 .
<br/><br/><label>ISBN: </label>978-0521435284 
<br/><br/><label>Dewey Class. No.: </label>516  / Iv94.HG