1. Townsend, A.T., O’Sullivan, J., Featherstone, A.M., Butler, E.C., and Mackey, D.J., J. Environ. Monit., 2001, vol. 3, no. 1, p. 113.
2. Chochorek, A., Bobrowski, A., Kiralyova, Z., and Mocak, J., Pol. J. Environ. Stud., 2010, vol. 19, no. 1, p. 59.
3. Murakami, M. and Takada, T., Talanta, 1990, vol. 37, p. 229.
4. Soylak, M., Saracoglu, S., Divrikli, U., and Elci, L., Talanta, 2005, vol. 66, p. 1098.
5. Zolotov, Yu.A., Tsizin, G.I., Dmitrienko, S.G., and Morosanova, E.I., Sorbtsionnoe kontsentrirovanie mikrokomponentov iz rastvorov. Primenenie v neorganicheskom analize (Adsorption Preconcentration of Trace Components from Solutions: Application to Inorganic Analysis), Moscow: Nauka, 2007.