ButterworthA., The Investigation of an Iron Correction Method in Optical Emission Spectroscopy (Information Services British Steel Corp., Sheffield, England, 1976).
2.
Hewlett-Packard Company, Copertino, CA, Basic Program “MULBEG”
3.
DraperN. R. and SmithH., Applied Regression Analysis (Wiley, New York, 1968), p. 365.
