Garcia, Luis, and Maria João Ferreira. “WelWel: Proposal for a Collaborative/Cooperative Learning Model in the Cloud”. International Journal of Learning, Teaching and Educational Research 10, no. 2 (February 28, 2015): 84–103. Accessed April 26, 2026. https://ijlter.myres.net/index.php/ijlter/article/view/1124.