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Proceedings of first seminar on UDC in a mechanized retrieval system, conducted by R.R. Freeman u. P. Atherton, Copenhagen, 2.-6.9.1968 (1969)
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Perry, J.W.: Mechanized searching and subject headings (1953)
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¬The UDC in mechanized subject information retrieval (1972)
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Compatibility and integration of order systems : Research Seminar Proceedings of the TIP/ISKO Meeting, Warsaw, 13-15 September 1995 (1996)
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Körner, H.G.: Short and flexible generic codes for mechanized information retrieval (1965)
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