REFERENCES
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- FULLER , A. T. , 1960 a , J. Electron. Contr. , 9 , 65 ; 1960 b, an example quoted by J. F. Barrett, Proc. 1st IFAC Congress, Moscow, 2, 724, supplemented in a private communication; 1961 a,.J. Electron. Contr., 10, 61; 1961 b,.Ibid., 10, 157; 1962, Ibid., 13, 589; 1963, Ibid., 14, 669 .
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- †Communicated by Dr. A. T. Fuller.
- ‡Previously at Cambridge University.