Liu, Rong, and Yongsheng Yan. “Liquid-Liquid Equilibrium of Aqueous Two-Phase Systems Containing PPG725 and Potassium Salts at 298.15 K”. Asian Journal of Chemistry, vol. 27, no. 3, Jan. 2015, pp. 1125-9, doi:10.14233/ajchem.2015.18430.