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

 - New York       Academic Press         1977 
 - xv, 172p.  cm. 
 - Mathematics in science and engineering; 138 .
<br/><br/><label>Standard No.: </label>41479 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Invariants<br/>Calculus of variations
<br/><br/><label>Dewey Class. No.: </label>B42, L7