1. R. Fletcher, “A model algorithm for composite NDO problems,”Mathematical Programming Studies 17 (1982) 67–76.
2. R. Fletcher,Practical methods of optimization, Vol. 1, Unconstrained optimization (John Wiley & Sons, New York, 1980).
3. R. Fletcher,Practical methods of optimization, Vol. 2, Constrained optimization (John Wiley & Sons, New York, 1981).
4. R. Fletcher, “Second order correction for nondifferentiable optimization”, in: G.A. Watson, ed.,Numerical analysis (Springer-Verlag, Berlin, 1982).
5. J.J. Móre, “Recent developments in algorithms and software for trust region methods,” in: A. Bachem, M. Grötschel and B. Korte, eds,Mathematical programming, The state of the art (Springer-Verlag, Berlin-Heidelberg, 1983).