Guptafson, Karl E <br/><br/>
Introduction to partial differential equations and hilbert space methods 

 - 3rd ed. 
 - Calcutta  International Journal Services  1993 
 - xxiii, 437 p. 
<br/><br/><label>ISBN: </label> RS1500 
<br/><br/><label>Dewey Class. No.: </label>515.353 G978I