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C. Lucchese, Orlando, S., Perego, R., Silvestri, F., and Tolomei, G., Identifying task-based sessions in search engine query logs, in Proceedings of the fourth ACM international conference on Web search and data mining, New York, NY, USA, 2011.
C. Macdonald, Ounis, I., and Tonellotto, N., Upper-bound approximations for dynamic pruning, ACM Trans. Inf. Syst., vol. 29, pp. 17:1–17:28, 2011.