1. Amjadi, A., Chomko, D.F., Rahbar, E. (2014). Case Record of Multivariate Statistical Analysis in the Groundwater Study of the Western Part of Iran (The Zagros Mountains). Journal of Applied Environmtntal and Biological Sciences, 4(2s). Text Road Publication. Retrieved from www.textroad.com.
2. Chomko, D.F., Chomko, F.V., Seifeldin, G. Kh., Taranov, V.G. (2012). Experience of applying cluster analysis in study of swelling soils of Sudan. Bulletin of V.N. Karasin Kharkiv National University, 1033. [in Russian]
3. Chomko, D.F., Koshliakov, O.Ye., Chomko, F.V., Udalov I.V., Chomko, R.F. (2017). Ukrainian-Russian-English dictionary-reference book of hydrogeological terms. Kyiv: Publ.house "Kyiv university". [in Ukrainian]
4. Chomko, D.F., Reshetov, I.K., Chomko, F.V., Chomko, R.F. (2002). Multidimensional statistical analysis in the study of man-made groundwater pollution. Geological Journal, 2. [in Russian]
5. Chomko, D.F., Reshetov, I.K., Chomko, F.V., Chomko, R.F. (2004). Multidimensional statistical analysis in hydrogeology. Kyiv: Publ.house "Kyiv university" [in Ukrainian]