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^Jones, Senior Reporter J. H. (1990). Amino Acids and Peptides. Boca Raton: CRC Press LLC. ISBN0-85186-134-2.
Roberts (1988). Bycroft, B.W. (ed.). Dictionary of antibiotics and related substances. A.A. Higton; A.D. Roberts (contributors). London: Chapman and Hall. ISBN0-412-25450-6.