M. Horridge, T. Tudorache, C. Nyulas, и M. Musen. OWL: Experiences and Directions Workshop (OWLED), том 1265 из CEUR Workshop Proceedings, стр. 109-120. CEUR-WS.org, (2014)
P. Monachesi, L. Lemnitzer, и K. Simov. Proceedings of the European Conference on Technology Enhanced Learning (EC-TEL 2006), том 4227 из Lecture Notes in Computer Science, стр. 667-672. Springer, (2006)