Information modelling and knowledge bases XXIII2012 https://www.iospress.com/catalog/books/information-modelling-and-knowledge-bases-xxiii Proceedings of the 21th [i. e. 21st] European-Japanese Conference on Information Modelling and Knowledge Bases : EJC2011 : Tallinn, Estonia, June 06-10, 20112011 http://www.ester.ee/record=b2714058*est Proceedings of the 21th [i. e. 21st] European-Japanese Conference on Information Modelling and Knowledge Bases : EJC2011 : Tallinn, Estonia, June 06-10, 2011. Vol. 22011 http://www.ester.ee/record=b2714060*est