A R Conn, K Scheinberg, L N Vicente, Introduction to derivative-free optimization (SIAM, 2009) – google
Numerical analysis 2000. Vol.4. Optimization and nonlinear equations, J Comput Appl Math 124 (2000)
Kelley C T, Iterative methods for linear and nonlinear equations (SIAM, 1995)
C Audet, L N Vicente, Derivative-free optimization: theory and practice (Mini-tutorial, 2008)
DFO - derivative-free optimizer
CONDOR - constrained, non-linear, derivative-free parallel optimizer for continuous, high computing load, noisy objective functions