Christodoulou, Demetrios,  1951- <br/><br/>
The action principle and partial differential equations / 
by Demetrios Christodoulou 
 - Princeton, N.J. :  Princeton University Press,  2000. 
 - viii, 319 p. ;  24 cm. 
 - Annals of mathematics studies ;  no. 146 .
<br/><br/>Includes bibliographical references (315-316) 
<br/><br/><label>ISBN: </label>0691049564 (cloth : alk. paper)  RM 100.30 
<br/><br/><label>LCCN: </label>99-044795 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Hyperbolic<br/>Symplectic manifolds