Alexandroff, Paul <br/><br/>
Elementary concepts of topology 
Paul Alexandroff; with a preface by D.Hilbert. Trans. from the German by A.E.Farley 
 - Mineola, NY  Dover Publications  1961 
 - 57 p. : ill. ; 22 cm 
<br/><br/> Includes bibliographical references 
<br/><br/><label>ISBN: </label>9780486607474 
<br/><br/><label>Dewey Class. No.: </label>513.83 ALE