Extended Boolean information retrieval

@article{Salton1983ExtendedBI,
  title={Extended Boolean information retrieval},
  author={Gerard Salton and Edward A. Fox and Harry Wu},
  journal={Commun. ACM},
  year={1983},
  volume={26},
  pages={1022-1036}
}
In conventional information retrieval Boolean combinations of index terms are used to formulate the users'' information requests. While any document is in principle retrievable by a Boolean query, the amount of output obtainable by Boolean processing is difficult to control, and the retrieved items are not ranked in any presumed order of importance to the user population. In the vector processing model of retrieval, the retrieved items are easily ranked in decreasing order of the query-record… 

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