References
- Anderson , T. W. 1958 . An Introduction to Multivariate Statistical Analysis , New York : John Wiley .
- Johnson , R. A. and Wichern , D. W. 1982 . Applied Multivariate Statistical Analysis , New Jersey : Prentice-Hall .
- Rao , C. R. 1965 . Linear Statistical Inference and Its Applications , New York : John Wiley .