Susan B. Davidson, Sanjeev Khanna, Tova Milo, Sudeepa Roy. Using the crowd for top-k and group-by queries. In Wang Chiew Tan, Giovanna Guerrini, Barbara Catania, Anastasios Gounaris, editors, Joint 2013 EDBT/ICDT Conferences, ICDT '13 Proceedings, Genoa, Italy, March 18-22, 2013. pages 225-236, ACM, 2013. [doi]