Callahan, James. <br/><br/>
Geometry of spacetime :  an introduction to special and general relativity / 
James J. Callahan. 
 - New York :  Springer,  c2000. 
 - xvi, 451 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0387986413 (acidfree paper) 
<br/><br/><label>Subjects--Index Terms: </label>Relativity  Space and time  Algebra,linear  Calculus of variations 
<br/><br/><label>Universal Decimal Class. No.: </label>51-71:530.12  / CAL