1. M.C.E. Pope, in: Electronic Process in Organic Crystals, Clarendon Press, Oxford University Press, Oxford, 1982.
2. E.A. Silinsh, V. Cápek, in: Organic Molecular Crystals, AIP Press, New York, 1994.
3. N.S. Sariciftci (Ed.), Primary Photoexcitations in Conjugated Polymers: Molecular Exciton versus Semiconductor Band Model, World Scientific, 1997.
4. Calculation and spectroscopic assignment of charge-transfer states in solid anthracene, tetracene and pentacene
5. Z.G. Zoos, M.H. Hennessy, D. Mukhopadhyay, in: N.S. Sariciftci (Ed.), Primary Photoexcitations in Conjugated Polymers: Molecular Exciton versus Semiconductor Band Model, World Scientific, 1997, p. 1.