Kolesnikov, Sergey, et al. “Approaches to the Development of Environmental Standards for the Content of Petroleum Hydrocarbons and Pb, Cr, Cu, Ni in Soils of Greatest Caucasus”. SAINS TANAH - Journal of Soil Science and Agroclimatology, vol. 19, no. 2, Dec. 2022, pp. 192-04, https://doi.org/10.20961/stjssa.v19i2.60119.