B.  Jayachandran, Phukan, P., Daniel, T., and Sudalai, A., ?Natural kaolinitic clay: a remarkable catalyst for highly regioselective chlorination of arenes with Cl-2 or SO2Cl2?, Indian Journal of Chemistry Section B-Organic Chemistry Including Medicinal Chemistry, vol. 45, no. 4, pp. 972-975, 2006.