Helms, Lester LaVerne,  1927- <br/><br/>
Introduction to potential theory / 
L. L. Helms. 
 - New York :  Wiley-Interscience,  1969. 
 - x, 282 p. :  ill. ;  24 cm. 
 - Pure and applied mathematics  v.xxii .
<br/><br/>p. 275-278 
<br/><br/><label>ISBN: </label>0471369314 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Potential, Theory of