1. “Bunseki Kagaku Benran,” ed. by the Japan Society for Analytical Chemistry, Maruzen, Tokyo, 1981, p. 232.
2. P. Sykes, “A Guidebook to Mechanism in Organic Chemistry,” 3rd Ed., Longmans Green, London; translated by T. Kubota, “Yuuki Hannou Kikou,” 3rd Ed., Tokyo Kagaku Dojin, 1971, p. 206.