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Allan, J.; Croft, W.B.; Callan, J.: ¬The University of Massachusetts and a dozen TRECs (2005)
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Robertson, S.; Callan, J.: Routing and filtering (2005)
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Callan, J.: Distributed information retrieval (2000)
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Collins-Thompson, K.; Callan, J.: Predicting reading difficulty with statistical language models (2005)
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