non-periodic phenomena in variable stars 
Universite De Liege Belgique 
 - Budapest  Academic Press  1969 
 - [various pagings.] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Variable stars
<br/><br/><label>Universal Decimal Class. No.: </label>082.2:52  / IAU-C4