Elpani, S. E., Gunawan, M. J., Aviventi, E., & Sabila, R. A. (2020). Utilization of Natural Coagulant Substance (Tamarind and Winged Bean Seed) on the Quality of Tofu Wastewater in Muntilan, Magelang. Indonesian Journal of Chemistry and Environment, 2(1), 25–32. https://doi.org/10.21831/ijce.v2i1.30294