1. Hahn, U. & Schnattinger, K.: An Empirical Evaluation of a System for Text Knowledge Acquisition. In Proceedings of the European Knowledge Acquisition Workshop (1997), 129–144, Spain.
2. Martínez-Béjar, R. & Martín-Rubio, F.: A mathematical functions-based approach for analysing elicited knowledge. In Proceedings of the Ninth International Conference on Software Engineering and Knowledge Engineering (1997), Madrid.
3. Schreiber, A. T., Akkermans, J. M., Anjewierden, A. A., De Hoog, R., Shadbolt, N. R., Van de Velde, W. & Wielinga, B. J.: CommonKADS. Engineering and Managing Knowledge. The CommonKADS Methodology. University of Amsterdam, 1998.
4. Van Heijst, G., Schreiber, A. T., & Wielinga, B.J. Using explicit ontologies in KBS development. International Journal of Human-Computer Studies, 45 (1997): 183–292.