1. (a) Structure and Mechanism in Organic Chemistry, Sections 7, 8, 46c and 46d. Cornell University Press, Ithaca, NY (1953).
2. (b) Physical Organic Chemistry, 2nd ed., Section 11.25. McGraw-Hill, New York (1970).
3. (c) Correlation Analysis of Chemical Data, Sections 5.1 and 5.2. Plenum Press, New York (1988).