1. Yashin, A.Ya. and Belyamova, T.T.,Zh. Anal. Khim., 1998, vol. 53, no. 4, p. 394.
2. Yashin, A.Ya., Gur’ev, I.A., and Ageev, A.N.,Zh. Anal. Khim., 1998, vol. 53, no. 10, p. 1066.
3. Yashin, A.Ya.,Bashk. Ekol. Vestn., 1999, vol. 4, no. 1, p. 29.
4. Johnson, D.C. and LaCourse, W.R.,Anal. Chem., 1990, vol. 62, no. 10, p. 589A.
5. Rocklin, R.D. and Pohl, CA.,J. Liq. Chromatogr., 1983, vol. 6, no. 9, p. 1577.