Astuti, Dwi. “Effectiveness of Aluminum Electrode in Reducing Bod, Cod, Ammoniac, and Chromium in Leather Tannering Waste With the Electrocoagulation Process”. Science Midwifery, vol. 10, no. 5, Dec. 2022, pp. 4378-82, doi:10.35335/midwifery.v10i5.1033.