Beardon, A. F. <br/><br/>
Complex Analysis :  The Argument Principle in Analysis and Topology 
/ by A. F. Beardon 
 - Singapore  John Wiley & Sons  1989 
 - xiii,239p. 
<br/><br/><label>ISBN: </label>9971510189 
<br/><br/><label>Dewey Class. No.: </label>515.9  / BEA/C