M. CHAMSAZ, M. HOSSEIN ARBABZAVAR, T. HEIDARI, A. HAJINIA, and T. SALEHI, “Spectrophotometric Determination of Trace Amounts of Beryllium in Natural Water Using Mean Centering of Ratio Spectra Method and Partial Least Squares Regression”, ajc, vol. 22, no. 6, pp. 4717–4726, May 2010.