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Drabenstott, K.M.; Weller, M.S.: Failure analysis of subject searches in a test of a new design for subject access to online catalogs (1996)
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Gödert, W.: ¬The design of subject access elements in online catalogues : Some problems (1991)
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Gödert, W.: Klassifikationssysteme und Online-Katalog (1987)
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Connell, T.H.: Subject cataloging (1996)
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Hirawa, M.: Role of keywords in the network searching era (1998)
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