BANOV , M.; IVANOV, P.; TSOLOVA , V.; BECH , J.; ZHYIANSKI , M.; BLAGIEV , M. RESOLVING OF ENVIRONMENTAL PROBLEMS CAUSED BY THE PROCESSING OF COPPER ORE. Bulgarian Journal of Agricultural Science, Sofia, BG, v. 20, n. 3, p. 581–589, 2014. Disponível em: https://agriacad.eu/ojs/index.php/bjas/article/view/6262.. Acesso em: 31 oct. 2026.