Kopal, Zdenek,  1914-1993 <br/><br/>
Close binary systems / 
Zdenek Kopal 
 - London :  Chapman & Hall,  1959 
 - xiii, 558 p. :  ill. ;  25 cm. 
 - International astrophysics series ;  5 .
<br/><br/>Includes bibliographies 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stars, Double