Ehlers, J. <br/><br/>
Lecture notes in physics-12 

 - New York  Springer-Verlag  1975 
 - viii, 492p. 
<br/><br/><label>ISBN: </label>0387057161 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Physics
<br/><br/><label>Dewey Class. No.: </label>530  / L39