1. Birgin, E. G., J. E. Martinez, and M. Raydan, 2000: Nonmonotone spectral projected gradient methods for convex sets. SIAM Journal on Optimization, 10, 1196–1121.
2. Deb, K., 2000: An efficient constraint handing method for genetic algorithms. Comput. Methods Appl. Mech. Engrg., 186, 311–338.
3. Deb, K., and R. B. Agrawal, 1995: Simulated binary crossover for continuous search space. Complex System, 9, 115–148.
4. Duan, W. S., and M. Mu, 2006: Investigating decadal variability of El Niño-Southern Oscillation asymmetry by conditional nonlinear optimal perturbation. J. Geophys. Res., 111, C07015, doi: 10.1029/2005JC003458.
5. Duan, W., and C. Wei, 2012: The spring predictability barrier for El Nino events and its possible mechanism results from a fully coupled model. Int. J. Climatol, doi: 10.1002/joc.3513.