@article{Flefel'2019assessment,
author={Flefel', H.E. and Gutova, M.O. and Donnik, I.M. and Gribovskiy, Y.G.},
title={ASSESSMENT OF HEAVY METALS CONCENTRATION FE, ZN, CD, AND PB IN NATURAL WATER SOURCES},
journal={Agrarian Bulletin of the},
publisher={Ural State Agrarian University},
year={2019},
pages={44-47},
volume={185},
issue={6},
}