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Kirkwood, H.P.: Ovid Web Gateway (1998)
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Hellweg, H.; Hermes, B.; Stempfhuber, M.; Enderle, W.; Fischer, T.: DBClear : a generic system for clearinghouses (2002)
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Koch, T.: Quality-controlled subject gateways : definitions, typologies, empirical overview (2000)
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Kirriemuir, J.; Brickley, D.; Welsh, S.; Knight, J.; Hamilton, M.: Cross-searching subject gateways : the query routing and forward knowledge approach (1998)
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Pitkow, J.E.: Summary of WWW characterizations (1998)
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