1. Hunt S (1985) The non-protein amino acids. In: Barrett GC (ed) Chemistry and biochemistry of the amino acids. Chapman and Hall, London, pp. 55?138
2. Roberts DC, Vellaccio F (1983) Unusual amino acid in peptide synthesis. In: Gross E, Meienhofer J (eds) The peptides. Academic Press, New York, vol. 5, pp. 341?449
3. Coppola GM, Schuster HF (1987) Asymmetric synthesis: construction of chiral molecules using amino acids, John Wiley & Sons, New York
4. Williams RM (1989) Synthesis of optically active ?-amino acids, Pergamon Press, Oxford
5. Miyazawa T, Takitani T, Ueji S, Yamada T, Kuwata S (1988) J Chem Soc, Chem Commun: 1214?1215