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Rahmstorf, G.: Information retrieval using conceptual representations of phrases (1994)
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Fagan, J.L.: ¬The effectiveness of a nonsyntactic approach to automatic phrase indexing for document retrieval (1989)
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Driscoll, J.R.; Rajala, D.A.; Shaffer, W.H.: ¬The operation and performance of an artificially intelligent keywording system (1991)
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Hofstede, M.: Zoeken in PiCarta : de proef op de som (1998)
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Bronson, R.J.: More NLM proximity searching hints (1996)
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