D. Max Roundhill, Imam Bakhsh Solangi, Shahabuddin Memon, M. I. Bhanger, and Mustafa Yilmaz , trans. 2009. “The Liquid-Liquid Extraction of Toxic Metals (Cd, Hg and Pb) by Calixarenes”. Pakistan Journal of Analytical & Environmental Chemistry 10 (1 & 2): 1-13. https://doi.org/10.21743/.