H. Holzmann, V. Goel, and A. Anand. Proceedings of the 16th ACM/IEEE-CS on Joint Conference on Digital Libraries, page 83--92. New York, NY, USA, ACM, (2016)
H. Holzmann, W. Nejdl, and A. Anand. Proceedings of the 39th International ACM SIGIR Conference on Research and Development in Information Retrieval, page 929--932. New York, NY, USA, ACM, (2016)