J. Brase and W. Nejdl, Ontologies and Metadata for eLearning, Handbook on Ontologies, 2003.

P. Brusilovsky and J. Vassileva, Course sequencing techniques for large-scale web-based education, International Journal of Continuing Engineering Education and Life-Long Learning, vol.13, issue.1/2, pp.75-94, 2003.
DOI : 10.1504/IJCEELL.2003.002154

V. Kolovski, S. Jordanov, and J. Galletly, An Electronic Learning Assistant Rousse, Bulgaria , from home.aubg.bg/faculty/jgalletly/Learning%20Assistant.doc Learning Technology Standards Committee of the IEEE Draft Standard for Learning Objects Ontology-based Organizational Memory for e-learning, International Conference on Computer Systems and Technologies, vol.7, issue.4, pp.98-111, 2002.

R. Mcgreal, Learning Objects: A Practical Definition, International journal of instructional technology and distance learning website, from http, 2004.

J. Santos and L. Anido, On the Application of the semantic Web Concepts to Adaptive Elearning, The 3rd IEEE International Conference on Advance of Learning Technologies, pp.480-489, 2003.

C. Ullrich, An instructional component for dynamic course generation and delivery, Proceedings of Berliner XML Tage 2003, pp.467-473, 2003.

C. Ullrich, Description of an instructional ontology and its application in web services for education, Proceedings of Workshop on Applications of Semantic Web Technologies for E-learning, SW-EL'04, pp.17-23, 2004.

J. Vassileva, G. Gross, U. Langer, and R. Seising, Education on the WWWStudieren und Forschen im Internet -Perspektiven fuer Wissenschaft, pp.107-124, 1997.