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Cuadra, C.A.; Katter, R.V.: Experimental studies of relevance judgements: final report : Vol.2: description of individual studies (1967)
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Aitchison, T.M.: Comparative evaluation of index languages : Part I, Design. Part II, Results (1969)
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Blagden, J.F.: How much noise in a role-free and link-free co-ordinate indexing system? (1966)
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- Journal of documentation. 22(1966), S.203-209