1. Hunt, S. (1985). Chemistry and Biochemistry of the Amino Acids, Chapman & Hall Ltd.
2. Toru, N., and Yamada, H. (1986). Biotechnology of Amino Acid Production, Tokyo: Kodansha Ltd.
3. Sano, K., Yokozeki, F., Tamura, F., Yasuda, N., Noda, I., and Mitsugi, K. (1977). Appl. Environ. Microbiol., 34, 806?810.
4. Sano, K., and Mitsugi, K. (1978). Agric. Biol. Chem., 42 (12), 2315?2321.
5. Ryu, O. H., and Shin, C. S. (1990). Kor. J. Appl. Microbiol. Biotechnol., 18(1), 49?55.