1. Robinson R (1932) Outline of an electrochemical (electronic) theory of the course of organic reactions. The Institute of Chemistry of Great Britain and Ireland, London
2. Ingold CK (1934) Chem Rev 15:225
3. Lennard-Jones JE (1929) Trans Faraday Soc 25:668
4. Fukui K (1964) In: Loewdin P-O, Pullman B (eds) Molecular orbitals in chemistry, physics, and biology. Academic Press, London, p 513
5. Fukui K (1971) Acc Chem Res 4:57