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Koch, T.: Quality-controlled subject gateways : definitions, typologies, empirical overview (2000)
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Heery, R.: Information gateways : collaboration and content (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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Dempsey, L.; Heijne, M.: Scientific information supply : building networked information systems (1996)
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