Chamsaz, Mahmoud, et al. “Simultaneous Spectrophotometric Determination of Triphenylmethane Dyes in Complex Samples Using Synthetic Accommodation of Unknown Interferents During Partial Least Square Regression”. Asian Journal of Chemistry, vol. 23, no. 3, Nov. 2010, pp. 1279-84, https://asianpubs.org/index.php/ajchem/article/view/16071.