Gianmaria Ajani Guido Boella Leonardo Lesmo Alessandro Mazzei Piercarlo Rossi Multilingual Ontological Analysis of European Directives. 2007 ACL http://aclweb.org/anthology-new/P/P07/P07-2006.pdf conf/acl/2007 db/conf/acl/acl2007.html#AjaniBLMR07