HUO, QING, et al. “Measurement and Correlation of Partition Coefficients of Glycyrrhizic in Aqueous Two-Phase EOPO K2HPO4 Systems”. Asian Journal of Chemistry, vol. 22, no. 6, May 2010, pp. 4496-00, https://asianpubs.org/index.php/ajchem/article/view/16760.