Vijaya Raju, K., and T. Rambabu. 2013. “Reductimetric Determination of Peroxydisulphate With Iron(II) in Phosphoric Acid Medium Using Resorufin As a Redox Indicator”. Asian Journal of Chemistry 25 (11):6453-54. https://doi.org/10.14233/ajchem.2013.14216A.