Gans, David. <br/><br/>
An introduction to non-euclidean geometry 

 - New York :  Academic Press,  1973 
 - 274 p. 
<br/><br/><label>LCCN: </label>71897 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometría no--euclidiana.
<br/><br/><label>Dewey Class. No.: </label>516.8  / G3