1. Learning by on-line gradient descent;Biehl;Journal of Physics,1995
2. Boyce, W. E. & DiPrima, R. C. (1986). Elementary Differential Equations and Boundary Value Problems. New York: Wiley.
3. Coddington, E. A. & Levinson, N. (1955). Theory of Ordinary Differential Equations. New York: McGraw-Hill.
4. Fahlman, S. E. (1988). Faster learning variations on back-propagation: an empirical study. In D. Touretzky, G. Hinton & T. Sejnowski (Eds.), Proceedings of the Connectionist Models Summer School (pp. 38–51). San Mateo: Morgan Kaufmann.
5. Gelb, A. & Vander Velde, W. E. (1968). Multiple-Input Describing Functions and Nonlinear System Design. New York: McGraw-Hill.