Gardini, Laura, Gian-Italo Bischi, and Daniele Fournier-Prunaret. 1999. “Characterization of Basin Boundaries in Bairstows Iterative Methods”. Annales Mathematicae Silesianae 13 (September):119-30. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14142.