Lanczos, Cornelius. <br/><br/>
The variational principles of mechanics / 
by Cornelius Lanczos. 
 - 4th ed. 
 - Toronto :  University of Toronto Press,  c1970. 
 - xxix, 418 p. 
 - Mathematical expositions ;  no. 4 .
<br/><br/><label>ISBN: </label>0802017436 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mechanics.<br/>Physics.<br/>Variational principles.<br/>Mathematical physics.