1. Anderson, J.R.: Cognitive Psychology and Its Implications, 5th edn. Worth Publishing, New York (2000)
2. Ausubel, D.P., Novak, J.D., Hanesian, H.: Educational Psychology: A Cognitive View, 2nd edn. Holt, Rinehart and Winston, New York (1978)
3. Chen, C., Hicks, D.: Tracing knowledge diffusion. Scientometrics 59(2), 199–211 (2004)
4. Chen, T.Y.: Using competence sets to analyze the consumer decision problem. European Journal of Operational Research 128, 98–118 (2001)
5. Council of Europe: Key competencies for Europe. Report of the Symposium in Berne (March 27-30, 1996); Council of Europe, Strasbourg (1997)