1. J. Lakovich, Principles of Fluorescent Spectroscopy (Plenum, New York, 1986).
2. R. Avarmaa, Mol. Phys. 37, 441 (1979).
3. L. Benthem, R. B. M. Koehorst, and T. J. Schaafsma, J. Mol. Struct. 79, 455 (1982).
4. K. Mauring, I. Renge, P. Sarv, and R. Avarmaa, Spectrochim. Acta A 43, 507 (1987).
5. I. V. Stanishevsky, K. N. Solovyev, S. M. Arabei, and V. A. Chernyavskii, in Proceedings of the 4th Congress of Belarus Physicists (Kovcheg, Minsk, 2013), p.216.