1. Mofett, J.G., Jr., and D.H. von Hennig, Soap Cosmet. Chem. Spec. 57:29 (1981).
2. Campbell, T.C., J.S. Falcone and G.C. Schweiker, Ibid. 54:33 (1978).
3. Anon., Cons. Res. Mag. 61:24(1978).
4. Zuidweg, M.H.J., C.J.K. Bos and H. van Welzen, Biotechnol. Bioeng. 14:685 (1972).
5. Te Nijenhuis, B. (to Gist-Brocades N.y.), U.S. Patent 4,002,572 (1977).