1. McCulloch W and Pitts W (1943) A logical calculus the ideas immanent in nervous activity, Bulletin Mathematical Biophysics, 5, 115–133.
2. Fitch FB, Review: McCulloch WS and Pitts W (1944) A logic calculus of the ideas immanent in nervous activity, Journal Symbolic Logic, 9, 49–50.
3. Hebb DO (1949) The Organization of Behaviour, John Wiley and Sons Inc.
4. Minsky M (1954) Steps towards artificial intelligence. In Feigenbaum, EA and Feldman, J, eds Computers & Thought, MIT Press, Cambridge, MA, USA.
5. Minksy M (1969) Perceptron, MIT Press, Cambridge, MA, USA.