1. L. N. Filimonov, Zavod. Lab.,15, 919 (1949); Zh. Anal. Khim.,15, 1178 (1949).
2. V. V. Nalimov and K. I. Ionova, Zh. Anal. Khim.,9, 76 (1954).
3. L. N. Filimonov, Proceedings of the Xth Conference on Spectroscopy [in Russian], Vol. 2, Physical Handbook, No. 4 (9), Izd. L'vovsk. Universiteta, L'vov (1958), p. 265.
4. O. P. Semenova and A. V. Durkina, Opt. i Spektr.,2, 34 (1957).
5. M. V. Petrova and O. P. Semenova, Spectroscopy, Methods, and Application [in Russian], Nauka, Moscow (1964), p. 52.