Vekua, I.N. <br/><br/>
Generalized analytic function   
by I.N. Vekua 
 - Oxford  Pergamon Press  1962 
 - xxix, 668p. 
 - Intr. Series Of Monographs On pure and Applied Mathematics .
<br/><br/><label>LCCN: </label>62-9699 
<br/><br/><label>Dewey Class. No.: </label>515.7  / N621