Khandpur, R., T. Ji, Y. Ning, L. Zhao, C.-T. Lu, E. Smith, C. Adams, and N. Ramakrishnan. “Determining Relative Airport Threats from News and Social Media”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 31, no. 2, Feb. 2017, pp. 4701-7, doi:10.1609/aaai.v31i2.19097.