Logan, John David <br/><br/>
Invariant variational principles / 
John David Logan 
 - New York :  Academic Press,  1977 
 - xv, 172 p. ;  24 cm. 
 - Mathematics in science and engineering series ;  v. 138 .
<br/><br/> Includes index 
<br/><br/>Bibliography: p. 165-168 
<br/><br/><label>ISBN: </label>0124547508 :  USD 17.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations<br/>Invariants<br/>Transformations (Mathematics)
<br/><br/><label>Dewey Class. No.: </label>517.4