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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.
Classification & authority control: expanding resource discovery: proceedings of the International UDC Seminar, 29-30 October 2015, Lisbon, Portugal . Edited by Aida Slavic & Maria In&s Cordeiro. Würzburg: Ergon Verlag, 2015.
These books can also be ordered from Ergon Verlag