1. Anderson, J. R.: Knowledge compilation: the general learning mechanism. In: Machine Learning: An Artificial Intelligence Approach, volume 2, (R. S. Michalski, J. G. Carbonell, & T. M. Mitchell, eds.). pp. 289–310. Los Altos, CA: Morgan Kaufmann 1986
2. Baril, D., Greer, J. E. & McCalla, G.I.: Student modelling with confluences. Proceedings of the AAAI Conference, Anaheim, CA pp. 43–48, 1991
3. Bartsch-Sporl, B., Reinders, M., Akkermans, H., Bredeweg, B., Christaller, T., Drouven, U., van Harmelen, F., Karbach, W., Schreiber, G., Vob, A., & Wielinga, B.: A Tentative Framework for Knowledge-Level Reflection. ESPRIT Basic Research Action P3178 REFLECT, Deliverable IR.2 RFL/BSR-ECN/I.3/1, BSR Consulting and Netherlands Energy Research Foundation ECN, August 1990
4. Bobrow, D. G. (ed.): Qualitative Reasoning about Physical Systems. Amsterdam: Elsevier Science Publishers 1984
5. Bredeweg, B.: Introduction of meta-levels to qualitative reasoning. Applied Artificial Intelligence, 3 (2), pp. 85–100 (1989)