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Biryukov, O.V. 2019. Research of Biogenic Substances Concentrations and their Connection with Runoff of the Siverskiy Donets River in the Borders of the Kharkiv Area. Visnyk of V. N. Karazin Kharkiv National University series «Еcоlogy». 20 (Jun. 2019), 104-115. DOI:https://doi.org/10.26565/1992-4259-2019-20-10.