Radmanović, S. B., M. M. Marković, U. D. Jovanović, M. D. Gajić-Kvaščev, D. M. Čokeša, and J. A. Lilić. “Properties of Humic Acids from Copper Tailings 20 Years After Reclamation”. Journal of the Serbian Chemical Society, vol. 85, no. 3, Mar. 2020, pp. 406-19, doi:10.2298/JSC190717112R.