1. Why a diagram is (sometimes) worth ten thousand words;Larkin;Cognitive Science Journal,1987
2. Reasoning with diagrammatic representations;Candrasekaran;AI Magazine,1993
3. Blackwell, A F `Diagrams about thoughts about thoughts about diagrams', in M Anderson (ed.) Reasoning with diagrammatic representations II: AAAI 1997 Fall Symposium, AAAI Press, Menlo Park, CA (1997) pp 77–84
4. Goodman, N Languages of Art: An Approach to a Theory of Symbols, Oxford University Press, London (1969)
5. Bertin, J Graphics and Graphic Information Processing, Walter de Gruyter, Berlin (1981)