David Gilbarg <br/><br/>
Elliptic partial differential equations of second order / 
David Gilbarg, Neil S. Trudinger 
 - 2nd ed., rev. 3rd printing. 
 - Berlin ; | New York :  Springer,  1998 
 - xiii, 517 p. ;  24 cm. 
 - Grundlehren der mathematischen Wissenschaften,  224 .
<br/><br/><label>ISBN: </label>354013025X (hardcover : alk. paper)