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3. D. P. Craig and S. H. Whalmsly, Excitons in Molecular Crystals( Benjamin, New York, 1968 )
4. S. A. Rice and J. Jortner, in: Physics and Chemistry of the Organic Solid State, F. Fox, M. Labes and A. Weissberger, eds. (Interscience Publishers, New York, 1967), Vol. III, Chap. 4
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