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Dahlberg, I.: Major developments in classification (1977)
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Wellisch, H.H.: Organisatorische Neuordnung des DK-Systems (1971)
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- Nachrichten für Dokumentation. 22(1971), S.55-63
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Dahlberg, I.: Einheitsklassifikation (1979)
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Dahlberg, I.: Classification theory, yesterday and today (1976)
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