1. C. G. Greenwald and J. M. Nystrom, Spectrum, Food Industry, Arthur D. Little Decision Resources (1988).
2. L. G. Butler, Enzyme Microb. Technol. 1, 253 (1979).
3. S. Fukui and A. Tanaka, Adv. Biochem. Eng. 29, 1 (1984).
4. M. D. Lilly, J. Chem. Tech. Biotechnol. 32, 162 (1982).
5. G. Carrea, Trends Biotechnol. 2, 102 (1984).