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Kreithen, A.; Gull, C.D.; Miller, E.E.: Klassifizierung nach dem System gleichwertiger Grundbegriffe (Uniterm) (1954)
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Gull, C.D.: Alphabetic subject indexes and coordinate indexes : an experimental comparison (1953)
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Taube, M.; Gull, C.D.; Wachtel, I.S.: Unit terms in coordinate indexing (1952)
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