1. G. A. Ketsle, L. V. Levshin, and Yu. A. Soinikov, Izv. Akad. Nauk SSSR, Ser. Fiz.,44, 789?793 (1980).
2. Yu. A. Soinikov, G. A. Ketsle, and L. V. Levshin, Zh. Prikl. Spektrosk.,30, No. 3, 446?453 (1979).
3. I. B. Birks, Photophysics of Aromatic Molecules, Wiley, New York (1970), pp. 75, 182.
4. R. F. Vasil'ev, A. A. Vychutinskii, and A. S. Cherkasov, Dokl. Akad. Nauk SSSR,149, No. 1, 124?127 (1963).
5. V. L. Ermolaev and E. B. Sveshnikova, Opt. Spektrosk.,28, No. 3, 601?603 (1970).