1. K. J. Hale, Anthony Charles Richardson (1935–2011) Adv. Car. Chem. Biochem., 66, 3, 2011.
2. N. K. Richtmyer, C. S. Hudson, J. Amer. Chem. Soc., 65, 1727, 1941.
3. A.C. Richardson, Proc. Chem. Soc., 430, 1961.
4. Personal email communication, June 10, 2018 from Dr. Karl J. Hale, Professor of Chemistry, Queen’s University, Belfast, Northern Ireland, UK.
5. D. Srinivasan and P. R Srinivasan, Biochem., Vol.6, No.10, p.3111, 1967.