A. Reza Ghiasvand, F. Moradi, S. Shadabi, H. Sharghi, and A. Reza Hasaninejad, “Selective Homogeneous Liquid-Liquid Extraction and Preconcentration of Thallium Using a New Calix[4]pyrrole”, ajc, vol. 18, no. 3, pp. 2016–2024, Mar. 2010.