General relativity and gravitation  proceedings of the ninth International conference held in Jena, Germany, 14-19 July 1980 
edited by E. Schmutzer                                          
 - Cambridge  Cambridge University Press  1983 
 - 312p. 
<br/><br/><label>ISBN: </label>0-521-24669-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>General relativity<br/>Gravitation
<br/><br/><label>Universal Decimal Class. No.: </label>530.12(063)  / GEN