1.
Li H, Hasegawa S, Kashihara A. A multi-layer map-oriented resource organization system for web-based self-directed learning combined with community-based learning. RPTEL [Internet]. 2015 Jul. 22 [cited 2024 May 2];10. Available from: https://rptel.apsce.net/index.php/RPTEL/article/view/2015-10014