Kristaly, Alexandru <br/><br/>
Variational principles in mathematical physics geometry and economics 

 - 1st 
 - Cambridge  Cambridge University press  2010 
 - xv,368 p. 
<br/><br/><label>ISBN: </label>978-0-521-11782-1 
<br/><br/><label>Subjects--Index Terms: </label>Calculus of variations