Billah, M. .; Rohmah, D. N. .; Sholahuddin, F. A. .; Panjaitan, R. .; Wahyusi, K. N. .; Dewati, R. Reducing Zinc and Chromium in Wastewater Treatment Biosolid Through Sulfuric Acid Extraction. nuscientech 2022, 367-369.