1. Barrett, J.F. The use of functionals in the analysis of nonlinear physical systems. J. Electron. Control. 15:567–615; 1963.
2. Goussard, Y. Wiener kernel estimation: A comparison of cross-correlation and stochastic approximation methods. In: Advanced methods of physiological system modeling: Vol. I. Los Angeles, california: USC Biomedical Simulations Resource; 1987: pp. 289–302.
3. Korenberg, M.J. Functional expansions, parallel cascades and nonlinear difference equations. In: Marmarelis, V.Z., ed. Advanced methods of physiological system modeling: Volume I. Los Angeles: USC Biomedical Simulations Resource; 1987: pp. 221–240.
4. Korenberg, M.J. Identifying nonlinear difference equation and functional expansion representations: The fast orthogonal algorithm. Ann. Biomed. Eng. 16:123–142; 1988.
5. Lee, Y.W.; Schetzen, M. Measurement of the Wiener kernels of a nonlinear system by crosscorrelation. Int. J. Contr. 2:237–254; 1965.