Hormander, Lars <br/><br/>
Linear Partial Differential Operators 
/ by Lars Hormander 
 - Fourth Printing 
 - Heidelberg;  Springer-Verlag:  1976. 
 - vii, 285p. 
<br/><br/><label>ISBN: </label>3540045007 
<br/><br/><label>Dewey Class. No.: </label>515.3  / HOR/L