[1] Powell M J D. Direct search algorithms for optimization calculations. Acta Numerica, 1998, 7: 287-336

[2] Conn A R, Toint Ph L. An algorithm using quadratic interpolation for unconstrained derivative free
optimization. In: Di Pillo G, Gianessi F, eds. Nonlinear Optimization and Applications. New York:
Plenum Publishing, 1996. 27-47

[3] Conn A R, Scheinberg K, Toint Ph L. On the convergence of derivative free methods for unconstrained
optimization. In: Iserles A, Buhmann M, eds. Approximation Theory and Optimization: Tributes to M J
D Powell. Cambridge: Cambridge University Press, 1997. 83-108

[4] Conn A R, Scheinberg K, Toint Ph L. A derivative free optimization algorithm in practice. Proceedings
of the AIAA St Louis Conference, 1998. 95-105

[5] Sorensen D C. The Q-superlinear convergence of a collinear scaling algorithm for unconstrained optimization.
SIAM J Numer Anal, 1980, 17: 84-114

[6] Conn A R, Scheinber K, Toint Ph L. Recent progress in unconstrained nonlinear optimization without
derivatives. Mathematical Programming, 1997, 79: 397-414

[7] Di S, Sun W. A trust region method for conic model to solve unconstrained optimization. Optimization
Methods and Software, 1996, 6: 237-263