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Liu, S.; Svenonius, E.: DORS: DDC online retrieval system (1991)
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Liu, S.: Online classification notation : proposal for a flexible faceted notation system (FFNS) (1990)
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Svenonius, E.; Liu, S.; Subrahmanyam, B.: Automation of chain indexing (1992)
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Liu, S.: Decomposing DDC synthesized numbers (1997)
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