Kolesnikov, Sergey I., Daria I. Moshchenko, Anna A. Kuzina, Kamil Sh. Kazeev, and Yuliya V. Akimenko. “Development of Regional Maximum Permissible Concentrations of Oil, Lead, Chromium, Nickel, and Copper in the Ordinary Black Soils of Central Ciscaucasia”. Amazonia Investiga 8, no. 24 (November 21, 2019): 38–44. Accessed October 15, 2024. https://amazoniainvestiga.info/index.php/amazonia/article/view/948.