Gelfand, I.M. <br/><br/>
Calculus of variations   
by I.M. Gelfand, S.V. Fomin, tr. & ed. by R.A. Silverman 
 - New Jersey  Prentice-Hall  1963 
 - vii, 232p. 
<br/><br/><label>LCCN: </label>63-18806 
<br/><br/><label>Dewey Class. No.: </label>515.64  / N63;1 R(T)