Course Concept Expansion in MOOCs with External Knowledge and Interactive Game Jifan Yu author Chenyu Wang author Gan Luo author Lei Hou author Juanzi Li author Zhiyuan Liu author Jie Tang author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication yu-etal-2019-course 10.18653/v1/P19-1421 https://aclanthology.org/P19-1421/ 2019-07 4292 4302