Gilbarg, David. <br/><br/>
Elliptic partial differential equations of second order /  
by David Gilbarg,Neil S.Trudinger. 
 - Second Edn. /  
 - Berlin Heidelberg :   Springer-Verlag ,   1993 
 - 513p :  
<br/><br/><label>ISBN: </label>3-450-13025-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Second Order Differential Equations
<br/><br/><label>Dewey Class. No.: </label>B3921L8  / M3