Preview available at Google books Cite book Title Maynooth Mathematical Olympiad Manual Last name Anthony G. O'Farell and Gary McGuire Publisher Logic Press Year of publication 2002 ISBN 0954426908 Page(s) cited 104 Chapter Complex numbers, 8.4.2 Complex roots of real polynomials 1 2 3 Alan Jeffrey (2005). "Analytic Functions". Complex Analysis and Applications.