[1] Montgomery D.C., Peck E.A., Vining G.G. (2001), Introduction to Linear Regression Analysis; 3rd
edition, Wiley.
[2] Neter J., Kutner M.H., Nachtsheim C.J., Wasserman W. (1996), Applied Linear Regression Models;
3rd edition, Irwin.
[3] MINITAB® Release 14.12.0, http://www.minitab.com, September 2010.
[4] R 2.11.1 system, http://www.r-project.org, September 2010.
[5] SAS 9.1 (Statistical Analysis System), http://www.sas.com, September 2010.