1. Montgomery, D. C., Design and Analysis of Experiments, 6th ed.Wiley, Hoboken, NJ, 2005, pp.373-463.
2. Myers, R. H., and Montgomery, D. C., Response Surface Methodology: Process and Product Optimization Using Designed Experiments, 1st ed.Wiley, New York, 1995, pp.1-123, 208-265.