1. Andreevskaya, V. D., and Zalashko, M. V. (1979). Prik. Biokhim. Mikrobiol., 15, 522.
2. AOAC (1980) in ?Official Methods of Analysis of the AOAC?, 13th ed., pp. 858.
3. Choi, S. Y., Ryu, D. D. Y., and Rhee, J. S. (1982) Biotechnol. Bioeng. 24, 1165.
4. Davies, J. and Gordon, T. (1984). in ?Proceedings of 6th Australian Biotechnology Conference,? pp. 127, Univ. of Queensland, St. Lucia, Brisbane.
5. Folch, J., Lees, M., and Sloane-Stanley, G. H. (1957). J. Biol. Chem. 226, 497.