Folland, G.B.. <br/><br/>
Lectures on Partial Differential Equations /  

 - 1st ed /  
 - New Delhi :   Narosa Publishing House. 
 - p.160 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B334  / M0