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Schmidt, A.F.: Vorschläge für eine partielle Modifikation der Dezimalklassifikation - dargestellt im Rahmen einer Kurzbeschreibung der DK (1987)
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Schmidt, A.F.: ¬Die langfristige Umwandlung der DK in eine universelle Facettenklassifikation (1973)
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Schmidt, A.F.: Gedanken zur Reform der Dezimalklassifikation (1972)
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Schmidt, A.F.; Wijn, J.H. de: Some possibilities for a new 'reformed' UDC (1972)
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