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Walker, S.: ¬The free language approach to online catalogues (1985)
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Walker, S.: ¬Der Mensch-Maschine-Dialog bei Online-Benutzer-Katalogen (1987)
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Walker, R.: Categorization
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Walker, S.: Views on classification as a search tool on a computer (1991)
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Riesthuis, G.J.A.: Subject searching in merged catalogues : a plea for redundancy (2008)
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Stone, M.B.: Information: a plea for clarity of meaning (1995)
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Bloomfield, M.: ¬A look at subject headings : a plea for standardization (1993)
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Granger, S.: Metadata and digital preservation : a plea for cross-interest collaboration (2000)
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Bornmann, L.: What do altmetrics counts mean? : a plea for content analyses (2016)
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