1. Mulliken, R.S.: Molecular compounds and their spectra. II. J. Am. Chem. Soc. 74, 811–824 (1952)
2. Mulliken, R.S.: Molecular compounds and their spectra. III. The interaction of electron donors and acceptors. J. Phys. Chem. 56, 801–822 (1952)
3. Foster, R.: Organic Charge Transfer Complexes. Academic Press, London and New York (1969)
4. Slifkin, A.M.: Charge-Transfer Interactions of Biomolecules. Academic Press, New York (1971)
5. Kollman, P.A.: Drug-target binding forces. In: Wolff, M.E. (ed.) Berger’s Medicinal Chemistry and Drug Discovery Principles and Practice, 5th edn, pp. 99–412. Wiley, New York (1995)