1. Delgado, P., Albi, T., and Navas, M.A., Grasas Aceites (Seville), 1987, vol. 38, no. 1, p. 1.
2. Yuan. Y.Y., Fen His Hua Hsuesh, 1981, vol. 9, p. 77, Chem. Abstr., 1981, vol. 95, p. 165.
3. Das, J.V., Ramachandran K.N., and Guptha V.K., Analyst, 1994, vol. 119, no. 6, p. 1387.
4. Zweig, G., Analytical methods for pesticides, plant growth regulators and food additives, vol. 2, Insecticides, New York: Academic Press, 1964.
5. Coly, A. and Aaron, J.J., Analyst, 1994, vol. 119, no. 6, p. 1205.