Mitsuhara, Hiroyuki, and Masami Shishibori. “Prototype Digital Signage System for Learning Material Delivery Focusing on Student Friendship”. International Journal of Emerging Technologies in Learning (iJET) 15, no. 22 (November 30, 2020): pp. 161–176. Accessed May 2, 2024. https://online-journals.org/index.php/i-jet/article/view/14171.