1. Klašnja-Milićević, A., et al.: E-Learning Systems: Intelligent Techniques for Personalization, vol. 112. Springer, Switzerland (2016)
2. Grabara, J., Bosun, P.: Consideration on online education in Romania. Int. Lett. Soc. Humanist. Sci. 14(1), 59–65 (2014)
3. Zaharias, P., Pappas, C.: Quality management of learning management systems: a user experience perspective. Curr. Issues Emerg. eLearning 3(1), 5 (2016)
4. Nafea, S.M., et al.: A novel adaptive learning management system using ontology. In: 2015 IEEE Seventh International Conference on Intelligent Computing and Information Systems (ICICIS). IEEE (2015)
5. Staab, S., Studer, R. (eds.): Handbook on Ontologies. Springer, Heidelberg (2010)