Simon O. Haykin. Neural Networks and Leaning Machines. Prentice Hall, 3rd ed., November 28, 2008.
David E. Rumelhart, Geoffrey E. Hinton, Ronald J. Williams. Learning Representations by back-propagating errors. Nature v. 323 (6088), pp. 533-536, October 8, 1986.
K. Levenberg. A Method for the Solution of Certain Non-Linear Problems in Least Squares. Quaterly of Applied Mathematics, vol 2, pp. 164-168, 1944.
D. Marquardt. An Algorithm for Least-Squares Estimation of Nonlinear Parameters. SIAM Journal on Applied Mathematics, vol 11 (2), pp. 431-441, 1963.