“Optimization of H2O2 COD and Fe3+ H2O2 Ratios in Combined Electrocoagulation-Fenton System for Petrochemical Wastewater Treatment”. CHEMICA: Jurnal Teknik Kimia, vol. 13, no. 2, Aug. 2026, pp. 88-103, https://doi.org/10.26555/chemica.v13i2.620.