Clark, Peter, Oren Etzioni, Tushar Khot, Ashish Sabharwal, Oyvind Tafjord, Peter Turney, and Daniel Khashabi. 2016. “Combining Retrieval, Statistics, and Inference to Answer Elementary Science Questions”. Proceedings of the AAAI Conference on Artificial Intelligence 30 (1). https://doi.org/10.1609/aaai.v30i1.10325.