Dacorogna, Bernard <br/><br/>
Introduction to the calculus of variations  
Bernard Dacorogna 
 - 3rd.ed.  
 - London  Imperial College Press  2015 
 - x+311p.  bib.;index 
<br/><br/><label>ISBN: </label>978-178326552 
<br/><br/><label>Universal Decimal Class. No.: </label>517.97  / DAC