1. V. A. Razumov, Zh. Prikl. Spektrosk.,24, 1117 (1976).
2. B. V. L'vov, Prib. Syst. Upr., No. 3, 27 (1977).
3. H. L. Kahn and D. C. Manning, Am. Lab.,4(8), 51 (1972).
4. J. B. Sanders and R. Stux, 5th Int. Conf. Atom. Spectrosc., Clayton, 1975, Melbourne (1975), p. A28.
5. A. T. Zander, Am. Lab.,8(11), 11 (1976).