Ehlers, J. (Ed.) Snipes, R. F. <br/><br/>
Lecture notes in physics- 22 

 - New Yor  Springer-Verlag  1973 
 - viii, 246p. 
<br/><br/><label>ISBN: </label>0387061940 
<br/><br/><label>Dewey Class. No.: </label>530.13  / L47