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Na, S.-H.; Kang, I.-S.; Roh, J.-E.; Lee, J.-H.: ¬An empirical study of query expansion and cluster-based retrieval in language modeling approach (2007)
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Kang, I.-S.; Na, S.-H.; Kim, J.; Lee, J.-H.: Cluster-based patent retrieval (2007)
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Na, S.-H.; Kang, I.-S.; Lee, J.-H.: Adaptive document clustering based on query-based similarity (2007)
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Kang, I.-S.; Na, S.-H.; Lee, S.; Jung, H.; Kim, P.; Sung, W.-K.; Lee, J.-H.: On co-authorship for author disambiguation (2009)
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Na, S.-H.; Kang, I.-S.; Lee, J.-H.: Parsimonious translation models for information retrieval (2007)
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