Bergmann, Stefan. <br/><br/>
Kernel functions and elliptic differential equations in mathematical physics   
by Stefan Bergman, M.Schiffer 
 - New York  Academic Press  1953 
 - xiii, 432p. 
 - Pure and Applied Mathematics .
<br/><br/><label>LCCN: </label>52-13362 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N534