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

 - New York   Academic press  1977 
 - 172p. 
 - Mathematics in science and engineering  138 .
<br/><br/><label>ISBN: </label>0124547508 
<br/><br/><label>Subjects--Index Terms: </label>Calculus variations  Invariants 
<br/><br/><label>Universal Decimal Class. No.: </label>517.97  / LOG