Lanczos, Cornelius <br/><br/>
The variational principles of mechanics 
Cornelius Lanczos                                          
 - 4th ed. 
 - New York  Dover Publications  1970 
 - xxix, 418p. 
 - Dover books on physics and chemistry .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Mechanics
<br/><br/><label>Universal Decimal Class. No.: </label>531  / LAN