1. M. A. Amerine, R. M. Pangboum and E. B. Roesslar, “Principles of Sensory Evaluation of Foods,” Academic Press, Inc., New York, 1965.
2. C. Hayashi and T. Komazawa, “Quantification Theory and Data Analysis,” Asakura, Tokyo, 1984, p. 89.
3. T. Okuno, T. Haga, H. Kume and M. Yoshizawa. “Multivariate Analysis,” Nikkagiren, Tokyo, 1981, p. 391.