Sun, Jiankai, Sobhan Moosavi, Rajiv Ramnath, and Srinivasan Parthasarathy. 2018. “QDEE: Question Difficulty and Expertise Estimation in Community Question Answering Sites”. Proceedings of the International AAAI Conference on Web and Social Media 12 (1). https://doi.org/10.1609/icwsm.v12i1.15015.