Kushnerov, Alexander V., and Valery A. Lipnitski. “Properties and Applications of G­-Orbits Polynomial Invariants of Errors in Reverse Codes”. Journal of the Belarusian State University. Mathematics and Informatics, no. 3, Jan. 2019, pp. 21-28, https://journals.bsu.by/index.php/mathematics/article/view/1009.