Gilbarg, David and Trudinger, Neil S. <br/><br/>
Elliptic partial differential equations of second order   

 - reprint of the 1998 
 - Berlin  Springer-Verlag  2001 
 - xiii, 517p. Bibl. Index. 
 - Classics in Mathematics .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>515.35  / G463.EP