1. An introduction to multivariate statistical analysis;Anderson,1958
2. Noncentral statistical distribution programs for a computer language;Bargmann,1964
3. The statistical problem associated with collinearity and a test for its presence;Belsley,1980
4. Forecasting and collinearity;Belsley,1981
5. Regression diagnostics: Identifying influential data and sources of collinearity;Belsley,1980