Fahrevi, G. A. ., and Salmahaminati. “Analysis of Chromium, Nickel, Zinc, and Manganese in Wastewater Matrices Using ICP-OES at PT Medialab Indonesia”. INDONESIAN JOURNAL OF CHEMICAL RESEARCH, vol. 11, no. 1, July 2026, doi:10.20885/ijcr.vol11.iss1.art16.