Sibghatullah Memon, Najma Memon, and Shahabuddin Memon, Trans., “Removal of Parathion from Aqueous Media Throughp-tert-Butylcalix[4]arene Based Modified Silica”, Pak. J. Anal. Environ. Chem., vol. 14, no. 2, pp. 28–37, Dec. 2013, doi: 10.21743/.