1. Andrew, A. M. (1959)Learning Machines. N.P.L. Symposium, No. 10. (H.M.S.O.) pp. 473.
2. Bernard, C. (1856)Leçons de Physiologie Experimentale appliquée à la medicine. Tome II, Leçon III. Bailliere et Fils, Paris.
3. Clymer, A. B. (1959)Direct System Synthesis by means of Computers. Trans. A.I.E.E. 1958/59, part 1, p. 798 (paper no. 58-1003).
4. Donaldson, P. E. K. (1960)Error Decorrelation—a Technique for Matching a Class of Functions. Proc. 3rd Internat. Conf. Med. Electron. I.E.E., London.
5. Fifer, S. (1961)Analog Computation. McGraw Hill, New York.