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McJunkin, M.C.: Precision and recall in title keyword searching (1995)
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Morton, D.: Refresher course : boolean and (searching or retrieval) (1993)
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Olsen, R.J.; Christensen, J.O.; Larsen, K.A.; Willey, K.: Implementing NOTIS keyword/Boolean searching : a case study (1989)
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Lucas, W.; Topi, H.: Form and function : the impact of query term and operator usage on Web search results (2002)
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Johnson, K.E.: OPAC missing record retrieval (1996)
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