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  1. Gull, C.D.: Alphabetic subject indexes and coordinate indexes : an experimental comparison (1953) 10.32 
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  2. Kreithen, A.; Gull, C.D.; Miller, E.E.: Klassifizierung nach dem System gleichwertiger Grundbegriffe (Uniterm) (1954) 10.32 
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  3. Taube, M.; Gull, C.D.; Wachtel, I.S.: Unit terms in coordinate indexing (1952) 10.32 
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