Brahma Nand & others/ Tyagi  <br/><br/>
Spherical Harmonics  and Partial  differential  equations  8th ed 

 -  Kedar nath ram nath co. 
 - 168 
<br/><br/><br/>ENGLISH 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>spherical
<br/><br/><label>Dewey Class. No.: </label>515.353  / NAN/TYA