Hormander,Lars <br/><br/>
Linear partial differential operators 

 - New York  Springer-Verlag  1976 
 - vii,285 p.  Includes Bibliography and Index 
 - De grundlehren der mathematischen wissenschaftn .
<br/><br/><label>ISBN: </label>3-540-04500-7 
<br/><br/><label>Dewey Class. No.: </label>B334,1 K9