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3. B. I. Shapiro, Theoretical Principles of Photographic Process (Editorial URSS, Moscow, 2000), p. 288 [in Russian].
4. E. McRae and M. Kasha, J. Chem. Phys. 28, 721 (1958).
5. M. Kasha, Physical Processes in Radiation Biology (Academic, New York, 1964), p. 17.