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Pao, M.L.; Worthen, D.B.: Retrieval effectiveness by semantic and citation searching (1989)
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- Journal of the American Society for Information Science. 40(1989), S.226-235
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MacCain, K.W.: Descriptor and citation retrieval in the medical behavioral sciences literature : retrieval overlaps and novelty distribution (1989)
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- Journal of the American Society for Information Science. 40(1989), S.110-114