Vikentiev, A.A., and V.V. Ivanov. “Methods of Recognition in the Space of Knowledge”. Bulletin of the Karaganda University. Mathematics Series 81, no. 1 (March 30, 2016): 26–34. Accessed July 10, 2025. https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/73.