1. Corallo, et al.: Enhancing communities of practice: an ontological approach. Paper Presented at 11th International Conference on Industrial Engineering and Engineering Management, Shenyang, China (2005)
2. Damiani, et al.: KIWI: A Framework for Enabling Semantic Knowledge Management. In: Damiani, E., et al. (eds.) Semantic Knowledge Management: An Ontology-Based Framework. New York Information science reference, Hershey (2009)
3. Ferraris, M.: Dove sei? Ontologia del telefonino, Bompiani Editore. Milano (2005)
4. Frank, A.U.: Ontology: a consumer’s point of view, pp. 1–13 (1996)
5. Frank, A.U.: ‘Ontology’. In: Kemp, K. (ed.) Encyclopedia of Geographic Information Science, Sage Publications, Thousand Oaks (2008)