Liu, Zhi-Jiang, Vera Levina, and Yuliya Frolova. “Retracted Article: Information Visualization in the Educational Process: Current Trends”. International Journal of Emerging Technologies in Learning (iJET) 15, no. 13 (July 10, 2020): pp. 49–62. Accessed May 5, 2024. https://online-journals.org/index.php/i-jet/article/view/14671.