1. Why do molecules interact? The origin of electron donor-acceptor complexes, hydrogen bonding and proton affinity
2. (b) in (Ed.): Molecular Complexes, Vol. 1, Elek Science, London 1973, pp. 1-48;
3. Elektron‐Donor‐Acceptor‐Verbindungen, XXXIII. Intramolekulare Chinhydrone der [3.3]Paracyclophan‐Reihe
4. For a discussion of EDA interactions in biological systems, see (a) Quantum Biochemistry, Wiley Interscience, New York 1963;
5. (b) Organic Charge-Transfer Complexes, Academic Press, London 1969, Chapt. 12, pp. 335-373.