Miller, S. L. (1981). “Reasons for the occurrence of the twenty coded protein amino acids”. Journal of Molecular Evolution 17 (5): 273–284. ISSN 0022-2844
Miller, S. L. (1981). “Reasons for the occurrence of the twenty coded protein amino acids”. Journal of Molecular Evolution 17 (5): 273–284. Bibcode: 1981JMolE