Lovelock, David. <br/><br/>
Tensors, differential forms and variational principles   
by David Lovelock, Hanno Rund 
 - New York  John Wiley & Sons  1975 
 - xi, 364p. 
 - Pure and Applied Mathematics, .
<br/><br/> Wiley-Interscience Publication 
<br/><br/><label>ISBN: </label>0471548405 
<br/><br/><label>Dewey Class. No.: </label>515.63  / N751;1