Petrovsky, I. G. <br/><br/>
Lectures on partial differential equations   

 - New York  Interscience Publication  1954 (Rep. 1961) 
 - x, 245p. 
<br/><br/> "Tr. from the Russian by A. Shenitzer".   
<br/><br/><label>Dewey Class. No.: </label>515.35  / P497.PD