An, Yingbo, Meiling Xu, and Chen Shen. “Classification Method of Teaching Resources Based on Improved KNN Algorithm”. International Journal of Emerging Technologies in Learning (iJET) 14, no. 04 (February 27, 2019): pp. 73–88. Accessed April 20, 2024. https://online-journals.org/index.php/i-jet/article/view/10131.