1. I. L. Varshavskii, A. Ya. Khesina, V. G. Voronin, et al., Probl. Okruzh. Sredy Prirod. Resur., No. 10, 40?47 (1986).
2. R. W. Jones, Berichte, No. 358, 23?38 (1980).
3. T. W. Stanley, J. E. Mecker, and M. J. Morgan, Environ. Sci. Technol.,1, No. 5, 927?929 (1967).
4. R. C. Pierce and M. Katz, Anal. Chera.,47, No. 10, 1743?1747 (1975).
5. Handbook for Controlling Atmospheric Pollution [in Russian], Gidrometeoizdat, Leningrad (1979).