Rao, K. Sankara, <br/><br/>
Introduction to Partial Differential Equations /  Textual Documents 
By K.Sankara Rao 
 - 3rd ed. 
 - New Delhi  PHI Learning Private Limited  2017 
 - pg488:  23cm. 
<br/><br/><label>ISBN: </label>978-81-203-4222-4 
<br/><br/><label>Subjects--Index Terms: </label>Mathematics G- Mathematics 
<br/><br/><label>Dewey Class. No.: </label>515.35