Conference on methods of local and global differential geometry in general relativity(Pennsylvania,1970) <br/><br/>
Methods of local and global differential geometry in general relativity   
ed. by J.Ehlers,[et al] 
 - Berlin  Springer-Verlag  1972 
 - 188p. 
 - Lecture notes in physics  V.14 .
<br/><br/><label>ISBN: </label>3540057935 
<br/><br/><label>Dewey Class. No.: </label>530.1106  / N72