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Voorbij, H.: ¬Een goede titel behoeft geen trefwoord, of toch wel? : een vergelijkend oderzoek titelwoorden - trefwoorden (1997)
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Schabas, A.H.: Postcoordinate retrieval : a comparison of two retrieval languages (1982)
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McJunkin, M.C.: Precision and recall in title keyword searching (1995)
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Bodoff, D.; Kambil, A.: Partial coordination : II. A preliminary evaluation and failure analysis (1998)
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