Symposium held in Berlin, 14-19 August,1967 <br/><br/>
Contributions to extension theory of topological structures - Proceedings   
ed. by J.Flachsmeyer, H.Poppe, F.Terpe 
 - New York  Academic Press  1969 
 - 279p. 
<br/><br/><label>LCCN: </label>79-84223 
<br/><br/><label>Dewey Class. No.: </label>514  / N69;1