1. Wei, W., Barnaghi, P.: The anatomy and design of a semantic search engine. Int. J. Commun. SIWN 3(March), 76–82 (2007)
2. Fok, A.W.P., Ip, H.H.S.: Educational ontologies construction for personalized learning on the web. Stud. Comput. Intell. 62, 47–82 (2007)
3. Wang, S.: Ontology of learning objects repository for pedagogical knowledge sharing. Interdiscip. J. e-Skills Lifelong Learn. 4, 001–012 (2017)
4. Lama, M., et al.: International Forum of Educational Technology & Society Semantic Linking of Learning Object Repositories to DBpedia Published by: International Forum of Educational Technology & Society Linked references are available on JSTOR for this article: Semantic, vol. 15, no. 4 (2012)
5. Hsu, I.C.: Intelligent discovery for learning objects using semantic web technologies. Educ. Technol. Soc. 15(1), 298–312 (2012)