1. A. V. Karyakin, L. I. Anikina, and T. S. Chirkova, Zh. Anal. Khim.,26, 820 (1971).
2. A. V. Karyakin, T. S. Chirkova, and L. A. Anikina, Zh. Prikl. Spekt.,13, 468 (1970).
3. Yu. I. Kiryukhin and Kh. S. Bagdasaryan, Abstracts for the Eighteenth All-Union Conference on Luminescence [in Russian], Izd. AN UkrSSR, Kiev (1969).
4. P. Carrer, Textbook of Organic Chemistry [Russian translation], Goskhimizdat, Leningrad (1960).
5. A. V. Karyakin, L. I. Anikina, and T. S. Chirkova, Zh. Prikl. Spektr.,15, No. 6 (1971).