Gilbarg David <br/><br/>
Elliptic partial differential equations of second order 

 - Berlin  Springer- Verlag          1977 
 - x, 401p.  cm. 
 - Grundlehren der mathematischen wissenschaften; 224p. .
<br/><br/><label>Standard No.: </label>22991 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B334,1,2, L7