Gans, David,  1907- <br/><br/>
An introduction to non-Euclidean geometry / 
David Gans 
 - New York :  Academic Press,  1973 
 - xii, 274 p. :  ill. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/>Bibliography: p. 263 
<br/><br/><label>ISBN: </label>0122748506 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry, Non-Euclidean<br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>513.8