Logan, John David <br/><br/>
Invariant variational principles 

 - New York  Academic press  1977 
 - xv, 172p.  22 cm.  HB. 
 - Mathematics in science and engineering series .
<br/><br/><label>ISBN: </label>0124547508 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Calculus of variations
<br/><br/><label>Dewey Class. No.: </label>515.64  / LOG