1. Borgo, S., Gangemi, A.: At the core of core ontologies. In Gangemi, A., Borgo, S., eds.: Pro ceedings of the Workshop on Core Ontologies in Ontology Engineering, CEUR-WS.org/Vol- 118 (2004)1-4
2. Gruber, T.R.: Toward principles for the design of ontologies used for knowledge sharing. International Journal of Human-Computer Studies 43 (1995) 907-928
3. Guarino, N.: Formal ontology in information systems. In Guarino, N., ed.: Proceedings of the Second International Conference on Formal Ontology in Information Systems, IOS Press (1998)3-15
4. Masolo, C., Borgo, S., Gangemi, A., Guarino, N., Oltramari, A.: Ontology Library (Wonder-Web Deliverable D18). Availableat
http://wonderweb.semanticweb.org/deliverables/documents/D18.pdf
(2003)
5. Masolo, C., Borgo, S.: Qualities in formal ontology. In Hitzler, P., Lutz, C., Stumme, G., eds.: Foundational Aspects of Ontologies (FOnt), Universitat Koblenz (2005) 2-16