Mendelson, Bert. <br/><br/>
Introduction to Topology /  

 - Second Ed. /  
 - Boston :   Allyn and Bacon Inc,. 
 - p.202 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Topology
<br/><br/><label>Dewey Class. No.: </label>B316  / K8M