1. Acosta CK, Bahr ML, Burdett JE, Jr, Cessac JW, Martinez RA, Rao PN, Kim HK (1991) Synthesis of unnatural amino acids. J Chem Res (S): 110?111; J Chem Res (M): 0914?0934
2. Alberghina L, Schmid RD, Verger R (eds) (1991) Lipases: structure, mechanism and genetic engineering. VCH, Weinheim
3. Alks V, Keith DD, Sufrin JR (1992) Synthesis of the constrainedl-methionine analog, (Z)-l-2-amino-4-methylthio-3-butenoic acid. Synthesis: 623?625
4. Anantharamaiah GM, Roeske RW (1982) Resolution of?-methyl amino esters by chymotrypsin. Tetrahedron Lett 23: 3335?3336
5. Ayi AI, Guedj R, Septe B (1995) Enzymatic hydrolysis of methyl 3,3-difluoro-2-amino esters. Synthesis ofD- andl-3,3-difluoro-2-amino acids and their derivatives. J Fluorine Chem 73: 165?169