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Schlapfer, K.: ¬The information content of images (1995)
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Layne, S.S.: Some issues in the indexing of images (1994)
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Ornager, S.: ¬The image as an information resource (1992)
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Roddy, K.: Subject access to visual records : what the 90s might portend (1991)
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Turner, J.: Indexing film and video images for storage and retrieval (1994)
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