Karthik Kumar B., Thiruvengada Rajan V.S., Amruth Kumar N., Angala Parameswari S., and Madhusudhana Chetty C., “Analytical method for the determination of pesticides in soil by thin layer chromatography”, Int. J. Res. Pharm. Sci., vol. 2, no. 4, pp. 685–687, Dec. 2011.