1. We have used the version of this force field implemented on MacroModel V2.5: W.C. Still, F. Mohamadi, N.G.J. Richards, W.C. Guida, M. Lipton, R. Liskamp, G. Chang, T. Hendrickson, F. DeGunst, and W. Hasel, MacroModel V2.5, Department of Chemistry, Columbia University, New York, NY 10027.
2. An internal-coordinate Monte Carlo method for searching conformational space
3. Stochastic exploration of molecular mechanics energy surfaces. Hunting for the global minimum