Advances in astronomy and astrophysics; V.6   
ed. by Zdenek Kopal 
 - New York  Academic Press  1968 
 - xi, 319p.  incl. bibl. 
<br/><br/><label>ISBN: </label>003206 
<br/><br/><label>Dewey Class. No.: </label>520.5  / N62.6 "SER"