Huang, Z., Liu, Q., Chen, E., Zhao, H., Gao, M., Wei, S., Su, Y. and Hu, G. 2017. Question Difficulty Prediction for READING Problems in Standard Tests. Proceedings of the AAAI Conference on Artificial Intelligence. 31, 1 (Feb. 2017). DOI:https://doi.org/10.1609/aaai.v31i1.10740.