1. I. Lochmuller, J. Chem. Technol. Biotechnol.,40, 33 (1987).
2. Bioprocess Technology,9, 7 (1987).
3. R. A. Whitehead, M. S. Chagnon, E. V. Gromon, and L. Josephson (Advanced Magnetics, Inc.), US Patent 4695392, September 22 (1987), Appln. No. 744434, June 13, 1985.
4. Matsunaga Todashi, Jpn Chem. Ind.,38, 263 (1987).
5. B. B. Schwartz and N. Blakemore, US Patent 4677067, June 30 (1987), Appln. No. 623373, June 22, 1984.