2) J. B. Birks, “Photophysics of Aromatic Molecules,” Wiley-Interscience, London (1970), Chap. 9;
S. P. McGlynn, T. Azumi, and M. Kinosita, “Molecular Spectroscopy of the Triplet State,” Prentice-Hall Inc., Englewood Cliff, New-Jersy (1969), Chap. 8.