1. (a) Ingold, G. K. A. Rep. Chem. Soc.
23 (1926) 129;
2. (b) Robinson, R. Two Lectures on an Outline of an Electrochemical (Electronic) Theory of the Course of Organic Reactions, London (Institute of Chemistry) 1932;
3. (c) Ingold, C. K. Chem. Rev. 15 (1934) 225;
4. (d) Ingold, C. K. idem, Structure and Mechanism in Organic Chemistry, London (Bell) 1953;
5. (e) ibid. p. 255