^IUPAC–IUB Joint Commission on Biochemical Nomenclature. Nomenclature and symbolism for amino acids and peptides: Recommendations 1983. European Journal of Biochemistry. 1984, 138 (1): 9–37. PMID 6692818. S2CID 1437908. doi:10.1111/j.1432-1033.1984.tb07877.x.