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Young, C.W.; Eastman, C.M.; Oakman, R.L.: ¬An analysis of ill-formed input in natural language queries to document retrieval systems (1991)
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- Information processing and management. 27(1991) no.6, S.615-622
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Kruschwitz, U.; AI-Bakour, H.: Users want more sophisticated search assistants : results of a task-based evaluation (2005)
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- Journal of the American Society for Information Science and Technology. 56(2005) no.13, S.1377-1393