Ge, Chao, and Cun Li. “Application of the Cosine Gray Model Based on System Cloud in the Forecast of Higher Education Scale”. International Journal of Emerging Technologies in Learning (iJET) 10, no. 8 (December 14, 2015): pp. 16–20. Accessed May 30, 2026. https://online-journals.org/index.php/i-jet/article/view/5207.