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Footnote

Wiederabgedruckt in: Readings in information retrieval. Ed.: K. Sparck Jones u. P. Willett. San Francisco: Morgan Kaufmann 1997. S.323-328.

Source

Information processing and management. 24(1988) no.5, S.513-523

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Source

Information processing and management. 24(1988) no.3, S.269-280