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2. McCulloch, W.S. and Pitts, W.H. (1943): “A logical Calculus of the Ideas Immanent in Nervous Activity”. Bull. Math. Biophysics, 5, pp 115–133.
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5. McCulloch, W.S. (1969): “Regenerative Loop”. The Journal of Nervous and Mental Disease, 149, pp 54–58.