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Theory and foundation of information retrieval : [Themenheft] (1978)
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Felleman, J.: Symposium on geographic information systems : [Themenheft] (1990)
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Career planning and job searching in the information age : [Themenheft] (1996)
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Wissensrepräsentation : [Themenheft] (1989)
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Summarizing text : [Themenheft] (1995)
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