1. J. E. Leffler and E. Grunwald, Rates and Equilibria of Organic Reactions ( Wiley, New York, 1963 )
2. Trudy konferentsii po problemam primeneniya korrelattsionnykh uravnenii v organicheskoi khimii (Proceedings of the Conference on Applications of Correlation Equations in Organic Chemistry), Tartu, 1962 (in Russian, with English summaries)
3. Yu. A. Zhdanov and V. I. Minkin, Korrelatsionnyi analiz v organicheskoi khimii ( Izd. rostovskogo universiteta, Rostov, 1966 )
4. L. P. Hammett, J. Amer. Chem. Soc., 59, 96 (1937)
5. H. H. Jaffe, Chem. Rev., 53, 191 (1953)