Becker, Martin <br/><br/>
The Principles and applications of variational methods 

 - Cambridge  M.I.T. Press  1964 
 - vii, 120 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Functional analysis
<br/><br/><label>Dewey Class. No.: </label>515.7  / BEC