Karamah, Eva Fathul, et al. “Preliminary Study of Ozonated Water to Preserve the Quality of Tofu: The Effect of Exposure Time and Replacement of Ozonated Water”. International Journal on Advanced Science, Engineering and Information Technology, vol. 11, no. 3, June 2021, pp. 962-7, doi:10.18517/ijaseit.11.3.13130.