Callahan, James J. <br/><br/>
The geometry of spacetime / 
James J. Callahan. 
 - [S.l.] :  Springer,  1999. 
 - 472 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0387986413 9780387986418 
<br/><br/><label>Dewey Class. No.: </label>530.11