Zhao, J. et al. 2014. Liquid-Liquid Microextraction with Vortex-Assisted for Determination of Palladium and Gold in Water Samples by Flame Atomic Absorption Spectrometry. Asian Journal of Chemistry. 26, 7 (Mar. 2014), 2027–2030. DOI:https://doi.org/10.14233/ajchem.2014.15632.