1. B. Pullman, ed., Molecular Associations in Biology, Academic Press, New York, 1968.
2. R. S. Mulliken and W. B. Person, Molecular Complexes, Wiley New York, 1969;
3. R. Foster, Organic Charge Transfer Complexes, Academic Press, London, 1969;
4. G. Brieglab, Elektronen Donator—Akzeptor Komplexe, Springer-Verlag, Berlin, 1961;
5. M. A. Slifkin, Charge Transfer Interactions of Biomolecules, Academic Press, London, 1971.