International School of Physics ''Enrico Fermi''Course XL <br/><br/>
General Realativity and Cosmology : proceedings 

 - VILondon  Academic Press  1971 
 - xi, 387 p. 
<br/><br/><label>ISBN: </label>50910 
<br/><br/><label>Dewey Class. No.: </label>523  / INT