Kotov, Vladimir M., and Natallia S. Bogdanova. “Bunch Technique for Semionline With Two Groups of Items”. Journal of the Belarusian State University. Mathematics and Informatics, no. 3 (November 20, 2019): 134–138. Accessed July 18, 2026. https://journals.bsu.by/index.php/mathematics/article/view/1048.