Pontriagin, Lev Semenovich  1908- <br/><br/>
The mathematical theory of optical processes, / 
by L.S. Pontriagi n and others.Authorized translation from the Russian ; Translator : K.N . Trirogoff ; Editor :  L.W. Neustadft. 
 - New York :  Interscience Publishers,  1963. 
 - viii, 360 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus, Operational.<br/>Maxima and minima.
<br/><br/><label>Dewey Class. No.: </label>517