Ekeland, Ivar. <br/><br/>
Convexity methods in Hamiltonian Mechanics.   
by Ivar Ekeland 
 - Berlin  Springer-Verlag  1990 
 - x, 247p 
 - Modern surveys in mathematics-19. .
<br/><br/><label>ISBN: </label>3540506136 
<br/><br/><label>Dewey Class. No.: </label>514.74  / N901