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Proceedings of second seminar on UDC in a mechanized retrieval system, conducted by R.R. Freeman, Frankfurt, 1.-5.6.1970. (1971)
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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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SIGIR'92 : Proceedings of the 15th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (1992)
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