Liu, Y.L., et al. “Dispersive Liquid-Liquid Microextraction Combined With Electrothermal Atomic Absorption Spectrometry for Determination of Trace Lead in Drinking Water Samples”. Asian Journal of Chemistry, vol. 23, no. 9, June 2011, pp. 4049-52, https://asianpubs.org/index.php/ajchem/article/view/10794.