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The '''Boolean model''' of [[information retrieval]] (BIR)<ref>{{citation | author1=Lancaster, F.W. | author2=Fayen, E.G. | title=Information Retrieval On-Line | publisher=Melville Publishing Co., Los Angeles, California | year=1973}}</ref> is a classical [[information retrieval]] (IR) model and, at the same time, the first and most adopted one. It is used by many IR systems to this day.{{citation needed|date=November 2010}}
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