Anastasia Analyti Grigoris Antoniou Carlos Viegas Damásio A Formal Theory for Modular ERDF Ontologies. 212-226 2009 RR http://dx.doi.org/10.1007/978-3-642-05082-4_15 conf/rr/2009 db/conf/rr/rr2009.html#AnalytiAD09