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Mahapatra, M.; Biswas, S.C.: PRECIS: its history and application : an extented state-of-the-art review from the beginning up to 1982 (1983)
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Dykstra, M.: Subject indexing and retrieval: what more can technology do? (1987)
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DeHart, F.E.; Glazier, J.: Computer searching on PRECIS : an exploration of measuring comparative retrieval effectiveness (1984)
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Michell, G.: Does PRECIS have feet of clay? : problems with the universality of the role operators (1979)
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