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Williamson, N.J.: Restructuring UDC : problems and possibilities (1992)
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Williamson, N.J.: UDC activities (1993)
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Williamson, N.J.: Deriving a thesaurus from a restructured UDC (1996)
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McIlwaine, I.C.; Williamson, N.J.: Restructuring of class 61 : medical sciences (1995)
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McIlwaine, I.C.; Williamson, N.J.: Restructuring of class 61 : medical sciences (1996)
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