Yourgrau, Wolfgang <br/><br/>
Variational principles in dynamics and quantum theory/ 
Wolfgang Yourgrau, Stanley Mandelstam. 
 - New York:  Dover,  1979, c1968. 
 - xiii, 201 p.:  graphs;  21 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0486637735 : 
<br/><br/><label>LCCN: </label>78073521 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Variational principles.<br/>Dynamics.<br/>Quantum theory.
<br/><br/><label>Dewey Class. No.: </label>530.15  / Y81v