1. Procs. for the Symposium on Computer Science and Education;JS Brown,1976
2. Cohen, P., Grinberg, M. (1983): A Theory of Heuristic Reasoning About Uncertainty. In: Al Magazine 4/2, 17–24.
3. Representation and Understanding;A Collins,1975
4. Emde, W., Schmiedel, A. (1983): Aspekte der Verarbeitung unsicheren Wissens. TU Berlin, Projekt KIT, Report 6.
5. Procs. of the IJCAI-81;MS Fox,1981