Duff, G. F. D. <br/><br/>
Partial differential equations. 
G.F.D. Duff 
 - Toronto,  University of Toronto Press,  1956. 
 - x, 248 p.  diagrs. 
 - Mathematical expositions  9 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Partial.
<br/><br/><label>Universal Decimal Class. No.: </label>517.95  / DUF