1. Box, G.E.P.: When Murphy speaks listen. Qual. Prog. 22, 79–84 (1989)
2. Hampel, F.R., Ronchetti, E.M., Rousseeuw, P.J., Stahel, W.A.: Robust Statistics. Wiley, New York (1986)
3. Belsley, D.A., Kuh, E., Welsch, R.E.: Regression Diagnostics: Identifying Influential Data and Sources of Collinearity. Wiley, New York (1980)
4. Hawkins, D.M.: Identification of Outliers. Chapman Hall, New York (1980)
5. Cook, R.D., Weisberg, S.: Residuals and Influence in Regression. Chapman Hall, New York (1982)