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Srinivasan, P.: Optimal document-indexing vocabulary for MEDLINE (1996)
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Boyce, B.R.; McLain, J.P.: Entry point depth and online search using a controlled vocabulary (1989)
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White, H.: Examining scientific vocabulary : mapping controlled vocabularies with free text keywords (2013)
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Fidel, R.: Writing abstracts for free-text searching (1986)
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Zavalina, O.L.: Complementarity in subject metadata in large-scale digital libraries : a comparative analysis (2014)
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