Alexandroff, Paul. <br/><br/>
Elementary concepts of topology 
/ by Paul Alexandroff 
 - New York:   Dover Publications Inc.,   1961. 
 - 57p. 
<br/><br/><label>ISBN: </label>048660747-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mappings<br/>Math<br/>Polyhedra<br/>Topological space
<br/><br/><label>Dewey Class. No.: </label>514  / ALE/E