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Longshu, L.; Xia, Z.: On an aproximate fuzzy information retrieval agent (1998)
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Berry, M.W.; Browne, M.: Understanding search engines : mathematical modeling and text retrieval (1999)
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Larson, R.R.: Cheshire 2 : design and evaluation of a next-generation online catalog system (1995)
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Sojka, P.: Exploiting semantic annotations in math information retrieval (2012)
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