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Perkins, M.: Why don't search engines work better? (1997)
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Jacobs, M.: Criteria for evaluating alternative MEDLINE search engines (1998)
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Iwazume, M.; Takeda, H.; Nishida, T.: Ontoloy-based information capturing from the Internet (1996)
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Van der Walt, M.: ¬The structure of classification schemes used in Internet search engines (1998)
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