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出版Cornell University, Department of Computer Science, 1973
URLhttp://books.google.com.hk/books?id=Mck6HwAACAAJ&hl=&source=gbs_api
註釋An attempt is made to characterize the usefulness of terms occurring in stored documents and user queries as a function of their frequency characteristics across the documents of a collection. It is found that the best terms are those having medium frequency in the collection and skewed frequency distributions. Correspondingly, terms exhibiting either very high or very low document frequency are not as useful.