S. Sen, M. Malta, D. Katoriya, B. Dutta, and A. Dutta. The 2020 IEEE/WIC/ACM International Joint Conference on Web Intelligence and Intelligent Agent Technology (WI-IAT'20), (2020)
C. Xiong, and J. Callan. Proceedings of the 2015 International Conference on The Theory of Information Retrieval, page 111--120. New York, NY, USA, ACM, (2015)