Nurmakhanov Н. Б., Usupov У. М. ., and Belasarov Б. Б. “Algorithm for Obtaining the Equations of the T4-4 Transformation of a Special Form and Their Properties”. Рroblems of Engineering and Professional Education, vol. 63, no. 4, Nov. 2022, p. 36, doi:10.32523/2220-685X-2021-63-4-36.