Classification and ontology: formal approaches and access to knowledge and Classification and visualization: interfaces to knowledge (2 books)
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Classification and ontology: formal approaches and access to knowledge: proceedings of the International UDC Seminar, 19-20 September 2011, The Hague, The Netherlands .
Edited by Aida Slavic & Edgardo Civallero. Würzburg: Ergon Verlag, 2011

Classification and visualization: interfaces to knowledge: proceedings of the International UDC Seminar, 24-25 October 2013, The Hague, The Netherlands . Edited by Aida Slavic, Almila Akdag Salah & Sylvie Davies. Würzburg: Ergon Verlag, 2013.

These books can also be ordered from Ergon Verlag