Reza Zarei, Ali, and Mohammad Ali Zarei. “Spectrophotometric Determination of Trace Amounts of Phenylhydrazine in Water and Biological Samples After Preconcentration by the Cloud Point Extraction Method”. Asian Journal of Chemistry, vol. 21, no. 2, Mar. 2010, pp. 1042-50, https://asianpubs.org/index.php/ajchem/article/view/18789.