Singh, Nahar, et al. “3-Hydroxy-3-Phenyl-1-M-Chlorophenyltriazene As Spectrophotometric and Complexometric Reagent in the Determination of Iron(III)”. Asian Journal of Chemistry, vol. 17, no. 1, Mar. 2016, pp. 265-9, https://asianpubs.org/index.php/ajchem/article/view/19761.