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Di Giulio M (1989). "The extension reached by the minimization of the polarity distances during the evolution of the genetic code". J. Mol. Evol.29 (4): 288–93. PMID2514270. doi:10.1007/BF02103616.
Wong JT (1980). "Role of minimization of chemical distances between amino acids in the evolution of the genetic code". Proc. Natl. Acad. Sci. U.S.A.77 (2): 1083–6. PMID6928661. doi:10.1073/pnas.77.2.1083.
IUPAC-IUBMB Joint Commission on Biochemical Nomenclature (JCBN) and Nomenclature Committee of IUBMB (NC-IUBMB) (1999). "Newsletter 1999". European Journal of Biochemistry264 (2): 607–609. doi:10.1046/j.1432-1327.1999.news99.x. Arquivado dende o orixinal(reprint, with permission) o 09 de xuño de 2011. Consultado o 19 de xuño de 2011.
IUPAC-IUBMB Joint Commission on Biochemical Nomenclature (JCBN) and Nomenclature Committee of IUBMB (NC-IUBMB) (1999). "Newsletter 1999". European Journal of Biochemistry264 (2): 607–609. doi:10.1046/j.1432-1327.1999.news99.x. Arquivado dende o orixinal(reprint, with permission) o 09 de xuño de 2011. Consultado o 19 de xuño de 2011.