1. Holstein, A. G. and Holsing G. C. (1962), US Patent 3,050,444 appl. Dawes Labr.
2. Kobayashi, T., Ban, T., Shimizu, S., Ohmiya, K., and Shimizu, S. (1978),J. Ferment. Technol. 56, 6, 506.
3. Hartmeier, W. (1979),Biotechnol. Lett. 1, 21.
4. Nurachi, T., Sakaguchi, Y., Tabata, M., Sugahara, M., and Endo, J. (1980),Biochimie,62, 581.
5. Goldstein, L., and Manecke, G. (1976),Applied Biochemistry and Bioengineering, vol. I, Wingard, L. B., Katchalski Katzir, E., and Goldstein G., eds., Academic, New York, pp. 23–127.