Marie Duzi Hannu Jaakkola Yasushi Kiyoki Hannu Kangassalo Information Modelling and Knowledge Bases XVIII, 16th European-Japanese Conference on Information Modelling and Knowledge Bases (EJC 2006), Trojanovice, Czech Republic, May 29th - June 2nd, 2006 EJC Frontiers in Artificial Intelligence and Applications 154 IOS Press 2007 978-1-58603-710-9 db/conf/ejc/ejc2006.html