1. W3C - Web Ontology Language (OWL).
http://www.w3.org/TR/owl-guide/
2. W3C - RDF Schema (RDFS).
http://www.w3.org/TR/rdf-schema/
3. D2R Server.
http://d2rq.org/d2r-server
4. Chondrogiannis, E., Andronikou, V., Karanastasis, E., Varvarigou, T.: A novel framework for user-friendly ontology-mediated access to relational databases. In: International Conference on Web and Semantic Technology, vol. 1(3), p. 1100. WASET (2014)
5. Chondrogiannis, E., Andronikou, V., Mourtzoukos, K., Tagaris, A., Varvarigou, T.: A novel query rewriting mechanism for semantically interlinking clinical research with electronic health records. In: 2nd International Conference on Web Intelligence, Mining and Semantics, pp. 48:1–48:12. ACM, New York (2012)