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Smeaton, A.F.; Kelledy, L.; O'Donnell, R.: TREC-4 experiments at Dublin City University : thresholding posting lists, query expansion with WordNet and POS tagging of Spanish (1996)
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Gauch, S.; Chong, M.K.: Automatic word similarity detection for TREC 4 query expansion (1996)
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Gauch, S.; Wang, J.: Corpus analysis for TREC 5 query expansion (1997)
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Buckley, C.; Allan, J.; Salton, G.: Automatic routing and retrieval using Smart : TREC-2 (1995)
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