Bergmann, P.G. <br/><br/>
Introduction to the theory of relativity 

 - Prentice Hall  N.Y.  1942 
 - 287p.  Fig. 
<br/><br/><label>Nat. Bib. No.: </label>1536 
<br/><br/><label>Universal Decimal Class. No.: </label>516.5/9  / BER