1. Sv. Boytcheva, O. Kalaydjiev, A. Nenkova and G. Angelova. Integration of Resources and Components in a Knowledge-Based Web-Environment for Terminology Learning. In Proc. AIMSA-2000, Springer, LNAI 1904, pp. 210–220.
2. McCalla, G. The Fragmentation of Culture, Learning, Teaching and Technology: Implications for the AI in Education Research Agenda in 2010. In IJAIE (2000), 11, pp. 177–196.
3. Vassileva, J. and B. Wasson. Instructional Planning Approaches: from Tutoring towards Free Learning. In Proc. EuroAIED’96, Lisbon, Portugal, 1996, pp. 1–8.
4. Brusilovsky, P. Adaptive and Intelligent Technologies for Web-based Education. In: C. Rollinger and C. Peylo (eds.) KI 1999 (4), pp. 19–25.
5. Deerwester S., Dumais S., Furnas G., Laundauer, T. and Harshman R.: Indexing by Latent Semantic Analysis. JASIS 41 (1990), pp. 391–475. LSA URL: http://lsa.colorado.edu (1990-99).