Y. Lin, B. Yu, A. Hall, and B. Hecht. Proceedings of the 2017 ACM Conference on Computer Supported Cooperative Work and Social Computing, page 2052--2067. New York, NY, USA, ACM, (2017)
H. Bast, A. Chitea, F. Suchanek, and I. Weber. Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval, page 671--678. ACM, (2007)