1. Armstrong, M.P. (1991): Knowledge Classification and Organization. In: Buttenfield, B.P., and McMaster, R.B. (eds.): Map Generalization — Making Rules for Knowledge Representation. London: Longman, 86–102.
2. Armstrong, M.P. (1993): A Coarse-Grained Asynchronous Parallel Approach to the Generation and Evaluation of Map Generalization Alternatives. NCGIA Specialist Meeting on Formalizing Cartographic Knowledge, Buffalo, 23.–27.10. 1993, 37–43.
3. Brassel, K.E., and Weibel, R. (1988). A Review and Framework of Automated Map Generalization. Int. Journal of Geographical Information Systems, 2(3): 229–44.
4. Buchanan, B., Barstow, D., Bechtal, R., Bennett, J., Clancey, W., Kulikowski, C., Mitchell, T., and Waterman, D. (1983): Constructing an Expert System. In: Hayes-Roth, F., Waterman, D., and Lenat, D. (eds.): Building Expert Systems. Reading, MA: Addison-Wesley.
5. Buttenfield, B.P. (1991): A Rule for Describing Line Feature Geometry. In: Buttenfield, B.P. and R.B. McMaster (1991): Map Generalization — Making Rules for Knowledge Representation. London: Longman UK: 1150–171.