1. OWL 2 Web Ontology Language Manchester Syntax, 2nd edn. W3C WG Note 11. https://www.w3.org/TR/owl2-manchester-syntax/ . Accessed May 2017
2. The OWL 2 Web Ontology Language (2016). http://www.w3.org/TR/owl2-overview/ . Accessed Apr 2016
3. Baader, F., Calvanese, D., McGuinness, D., Nadi, D., Patel-Schneider, P.F. (eds.): The Description Logic Handbook. Cambridge University Press, Cambridge (2003)
4. Horridge, M., Bail, S., Parsia, B., Sattler, U.: The cognitive complexity of OWL justifications. In: Aroyo, L. et al. (eds.) ISWC 2011. LNCS, vol. 7031, pp. 241–256. Springer, Heidelberg (2011). doi: 10.1007/978-3-642-25073-6_16
5. Lecture Notes in Computer Science;M Horridge,2008