Paulo Carvalho, Min Gao, Benjamin Motz, Ken Koedinger. Analyzing the relative learning benefits of completing required activities and optional readings in online courses. In Kristy Elizabeth Boyer, Michael Yudelson, editors, Proceedings of the 11th International Conference on Educational Data Mining, EDM 2018, Buffalo, NY, USA, July 15-18, 2018. International Educational Data Mining Society (IEDMS), 2018. [doi]