Astrophysics and gravitation 
Universite' de Bruxelles                                     
 - Belgique  Edtions de l'Universite de Bruxelles  1974 
 - [various pagings.] 
<br/><br/><label>ISBN: </label>2-8004-0596-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Astrophysics<br/>Gravitation
<br/><br/><label>Universal Decimal Class. No.: </label>524.834(063)  / AST