[1] Cook, R. D. (1977). Detection of Influential Observations in Linear Regression. Technometrics, 19, 15-18.
[2] Cook, R. D. and Wesiberg, S. (1982). Residuals and Influence in Regression. Chapman & Hall, New York [3] Belsley, D. A., Kuh. E. and Welsch. R. E. (1980). Regression Diagnostics: Identifying Influential Data and Soureces of
Collinearity. John Wiley & Sons, New York.
[4] Kim, C. (1996). Cook’s Distance in Spline Smoothing, Statist Proba Lett., 31, 139-144. [5] Kim, C., Park, B. U. and Kim, W. (2002). Influence Diagnostics in Semiparametric Regression Models, Statist. Probab. Lett, 60, 49-58.