Yourgrau, Wolfgang <br/><br/>
Variational principles in dynamics and quantum theory  
by Wolfgang Yourgrau and Stanley Mandelstam  
 - 3rd ed. 
 - London   Sir Isaac Pitman   1968 
 - xiii,201p.;22cm. 
<br/><br/><label>Dewey Class. No.: </label>530.12  / YOU