Kolesnikov, S., Moshchenko, D., Kuzina, A., Kazeev, K., & Akimenko, Y. (2019). Development of Regional Maximum Permissible Concentrations of Oil, Lead, Chromium, Nickel, and Copper in the Ordinary Black Soils of Central Ciscaucasia. Amazonia Investiga, 8(24), 38-44. Retrieved from https://amazoniainvestiga.info/index.php/amazonia/article/view/948