1. Dear, R. E. (1959).A principal component missing data method for multiple regression models (SP-86). Santa Monica, CA: System Development Corporation.
2. Fisher, W. D. (1958). On grouping for maximum homogeneity.Journal of the American Statistical Association, 53, 789–798.
3. Gifi, A. (1990).Nonlinear multivariate analysis. Chichester: Wiley.
4. Gleason, T. C., & Staelin, R. (1975). A proposal for handling missing data.Psychometrika, 40, 229–252.
5. Greenacre, M. J. (1984).Theory and applications of correspondence analysis. New York: Academic Press.