Schaum`s outlines complex variables/ 
Spiegel,Murray R. & others 
 - 2nd.ed. 
 - New York:  Mcgraw hill,  2009. 
 - 374 
<br/><br/><label>ISBN: </label>9780071615693 
<br/><br/><label>Dewey Class. No.: </label>515.9  / SPI/S