Moiseiwitsch, B.L. <br/><br/>
Variational principles   
by B.L. Moiseiwitsch 
 - London  Wiley Interscience Publishers  1966 
 - x, 310p. 
 - Interscience Monographs & Texts in Physics and Astronomy .
<br/><br/><label>LCCN: </label>66-17233 
<br/><br/><label>Dewey Class. No.: </label>515.64  / N66