M.  Kimura, ?A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences?, Journal of Molecular Evolution, vol. 16, pp. 111?120, 1980.

M.  Kimura, ?The neutral theory as a basis for understanding the mechanism of evolution and variation at the molecular level?, in Molecular evolution, protein polymorphism and the neutral theory, M.  Kimura, Ed. Berlin: Springer, 1982, pp. 3-56.