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Lancaster, F.W.; Mills, J.: Testing indexes and index language devices : the ASLIB Cranfield project (1964)
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Cleverdon, C.W.; Mills, J.; Keen, M.: Factors determining the performance of indexing systems : ASLIB Cranfield research project (1966)
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Cleverdon, C.W.; Mills, J.: ¬The testing of index language devices (1997)
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Cleverdon, C.W.; Mills, J.: ¬The testing of index language devices (1985)
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