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George, Louis, et al. “Determination of Thallium in Environmental Samples by Surfactant Assisted Dispersive Liquid-Liquid Microextraction Combined With First Order Derivative Spectrophotometry”. European Journal of Chemistry, vol. 6, no. 2, June 2015, pp. 183-8, doi:10.5155/eurjchem.6.2.183-188.1241.