Maroo, Usha, et al. “Spectrophotometric Determination of Magnesium(II) With 3-Hydroxy-3-M-Tolyl-1-P-Nitrophenyltriazene”. Asian Journal of Chemistry, vol. 11, no. 3, Mar. 2010, pp. 1042-5, https://asianpubs.org/index.php/ajchem/article/view/23424.