Krasil'shchik, I.S & Vinogradov, A.M (eds) <br/><br/>
Symmetries & conservation laws for differential equations of mathematical physics 
Ed by I.S. Krasil'shchik & A.M. Vinogradov 
 - Providence  American Mathematical Society  1999 
 - xiv  333 
 - Translations of mathematical monographs 182 .
<br/><br/><label>ISBN: </label>9780821809587 
<br/><br/><label>Dewey Class. No.: </label>11.07+10.13+6.05  / KRAS