Sahraoui, H., and M. Hachicha. “Determination of Trace Elements in Mine Soil Samples Using a Portable X-Ray Fluorescence Spectrometer: A Comparative Study With ICP-OES”. Engineering and Applied Science Research, vol. 43, no. 3, July 2016, pp. 162-5, https://ph01.tci-thaijo.org/index.php/easr/article/view/42971.