1. Box GEP, Draper NR (1987) Empirical model-building and response surfaces. Wiley
2. Box GEP, Hunter WG, Hunter JS (1978) Statistics for experimenters. an introduction to design, data analysis, and model building. Wiley
3. Boyd S, El Ghaoui L, Feron E, Balakrishnan V (1994) Linear matrix inequalities in system and control theory, ser. Vol. 15 of Studies in Appl Math. SIAM
4. Choi M, Lam T, Reznick B (1995) Sums of squares of real polynomials. Proc Symp Pure Math 58(2):103–126
5. Folland G (1999) Real analysis: modern techniques and their applications. Wiley