Morse, Marston <br/><br/>
Calculus of variations in the large 

 - New York  American mathematical society         1934 
 - ix, 368 p.  Includes bibliographical references and index 
 - American mathematical society colloquium publications; 18 .
<br/><br/> Bibliography : P.359-366 
<br/><br/><label>Source: </label> Reference