1. Dixon, L. C. W.,Nonlinear Optimization: A Survey, Software for Numerical Mathematics and Its Applications, Edited by D. J. Evans, Academic Press, London, England, pp. 193–218, 1973.
2. Dixon, L. C. W. andPrice, R. C. Truncated Newton Method for Sparse Unconstrained Optimization Using Automatic Differentiation, Journal of Optimization Theory and Applications, Vol. 60, pp. 261–275, 1989.
3. Spedicato, E. P.,On a Conjecture of Dixon and Other Topics in Variable Metric Methods, Technical Report SMSIA 75/15, University of Bergamo, 1975.