Shportko, Oleksandr, Kateryna Malash, and Andrii Bomba. “Using of Memoization in Arithmetic Operations Sign Placement Problems”. Modeling, Control and Information Technologies: Proceedings of International scientific and practical conference, no. 3 (November 5, 2019): 202–207. Accessed August 16, 2022. https://itconfdoc.nuwm.edu.ua/index.php/ITConf/article/view/76.