1. Addinsoft, XLSTAT software. Available online at: https://www.xlstat.com/en/ (accessed May 2019).
2. Aubert, H., Pinta, M., 1977. Trace elements in soils. Developments in Soil Science, no. 7, Elsevier, Amsterdam, 396 pp.
3. Semi-quantitative evaluation of secondary carbonates via portable X-ray fluorescence spectrometry;Chakraborty;Soil Sci. Soc. Am. J.,2017
4. Use of portable X-ray fluorescence spectrometry for classifying soils from different land use land cover systems in India;Chakraborty;Geoderma,2019
5. Metode de pretratament în analizele mineralogice de sol aplicate la studiul fracției grosiere;Codarcea;Știința Solului,1972