Baum, John D. <br/><br/>
Elements of point set topology / 
by J.D. Baum. 
 - New York :  Dover,  1964. 
 - X, 150 p. :  fig. ;  21 cm. 
<br/><br/>Index pp. 147-150 
<br/><br/><label>ISBN: </label>0-486-66826-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Topology