Jo, Jaechoon, Yeongwook Yang, and Heuiseok Lim. “A Study on the Development of Game-Based Mind Wandering Judgment Model in Video Lecture-Based Education”. Proceedings of Engineering and Technology Innovation 100 (October 11, 2018): 08-12. Accessed April 23, 2021. https://ojs.imeti.org/index.php/PETI/article/view/2748.