DAMIAN, Gianina Elena, et al. “LEAD AND COPPER REMOVAL FROM MULTI-METAL CONTAMINATED SOILS THROUGH SOIL WASHING TECHNIQUE USING HUMIC SUBSTANCES AS WASHING AGENTS: THE INFLUENCE OF THE WASHING SOLUTION PH”. Studia Universitatis Babeș-Bolyai Chemia, vol. 64, no. 1, Mar. 2019, pp. 41-52, doi:10.24193/subbchem.2019.1.03.