Gilbarg, David. <br/><br/>
Elliptic partial differential equations of second order   
by David Gilbarg, Neil S.Trudinger 
 - 2nd 
 - Berlin  Springer-Verlag  1998 
 - xiii, 517p. 
 - Series of comprehensive studies in mathematics  224 .
<br/><br/><label>ISBN: </label>354013025X 
<br/><br/><label>Dewey Class. No.: </label>515.353  / N98