Plessis Nicolaas Du <br/><br/>
Introduction to potential theory 

 -  1970 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>23579 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B394L85, L0