Зеленський, О. В, and В. М. Дармосюк. 2015. “The Sum of Elements of the Reduced Exponent Matrix”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics 82 (December), 61-66. https://doi.org/10.26565/2221-5646-2015-82-06.