Weinstock, Robert <br/><br/>
Calculus of variations:   With applications of physics and engenieering 

 - New York:   McGraw Hill,   1952. 
 - x, 326 p.:   graf.;  
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECUACIONES DIFERENCIALES ORDINARIAS<br/>GEOMETRICAL OPTICS<br/>QUANTUM MECHANICS<br/>EIGENFUNCTIONS