1. Oshima, K., Bull. Agric. Chem. Soc. Japan, 7, 332 (1931).
2. Namba, S., and Saito, T., Gakugei, 5, 70 (1954).
3. Waksman, S. A., Garey, C. L., and Allen, M. C., J. Bact., 28, 213 (1934).
4. Inoue, K., and Ando, Y., J. Agric. Chem. Soc. Japan, 30, 742 (1956).
5. Kooiman, P., Biochim. Biophys. Acta, 13, 338 (1954).