1. Cornell, J. A. (2002).Experiments with Mixtures: Designs, Models, and the Analysis of Mixture Data, 3rd edition. John Wiley and Sons, New York.
2. Myers R. H. and Montgomery, D. C. (2002).Response Surface Methodology, 2ndedition. John Wiley and Sons, New York.
3. Stat-Ease (2007). Design-Expert Software. Minneapolis, MN.