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Fugmann, R.: Obstacles to progress in mechanized subject access and the necessity of a paradigm change (2000)
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Perry, J.W.: Mechanized searching and subject headings (1953)
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Körner, H.G.: Short and flexible generic codes for mechanized information retrieval (1965)
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Bristol, R.P.: Control of subject information : can it be mechanized? (1950)
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Scibor, E.: Some remarks on the future desired development of UDC from the viewpoint of mechanized information retrieval (1971)
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