1. Hacking, A. J. (1987),Economic Aspects of Biotechnology, Cambridge University Press, New York.
2. Cheetham, P. S. J. (1985),Handbook of Enzyme Biotechnology, chapter 3, Wiseman, A., ed., Ellis Horwood Limited, Chichester, UK, p. 275.
3. Beech, G. A., Melvin, M. A., and Taggart, J. (1985),Biotechnology Principles and Applications, Higgins, J., Best, D. J., and Jones, J., eds., Blackwell Scientific Publications, Oxford.
4. Zahner, H. (1987),Fundamentals of Biotechnology, chapter 13, Prave, P., Faust, U., Sittig, W., and Sukatsch, D. A., eds., VCH Publisher, New York, NY, p. 515.
5. Best, D. J. (1985),Biotechnology Principles and Applications, chapter 4, Higgins, J., Best, D. J., and Jones, J., eds., Blackwell Scientific Publications, Oxford, p. 111.