REFERENCES
- Dunn , C. 1989 . Review of Applied Multivariate Statistical Analysis (2nd ed.) . Technometrics , 31 : 265 by R. A. Johnson and D. W. Wichern
- Johnson , R. and Wichern , D. 1988 . Applied Multivariate Statistical Analysis, , 2nd ed. Englewood Cliffs , NJ : Prentice-Hall. .