Ehlers, J. (Ed.) Erdmann, J. C. <br/><br/>
Lecture notes in physics- 1 

 - Berlin  Springer-Verlag  1969 
 - 283p. 
<br/><br/><label>ISBN: </label>3540084305 
<br/><br/><label>Dewey Class. No.: </label>530  / L39