Kopach, M.I., A.F. Obshta, and B.A. Shuvar. 2010. “On Applications of Iteration Algorithms and Skorobagatko’s Branching Fractions to Approximation of Roots of Polynomials in Banach Algebras”. Carpathian Mathematical Publications 2 (1):82-86. https://vps.pnu.edu.ua/index.php/cmp/article/view/3994.