1. V. V. Gruzinskii, Izv. Akad. Nauk SSSR, Ser. Fiz., 53, 1148 (1989).
2. P. E. Nielsen, J. B. Hansen, T. Thomsen, and O. Buchardt, Experientia, 39, 1063 (1983).
3. A. Albert, The Acridines, Edward Arnold, London (1966).
4. L. P. Hammett, Physical Organic Chemistry, 2nd edn., McGraw-Hill, New York (1970).
5. B. M. Krasovitskii and B. M. Bolotin, Organic Luminophores [in Russian], Khimiya, Moscow (1984).