1. Allen, M. B., and Arnon, D. I. (1955) Plant Physiol. 30:366?372.
2. Andersen, K., and Shanmugam, K. T. (1977) J. Gen. Microbiol. 103:107?122.
3. Barker, R. (1978) In: Rice Farming in Selected Areas of Asia. p. 35. The International Rice Research Institute, Los Banos, Philippines.
4. Herdt, R. W. (1982) IRRI Research Paper Series #76. The International Rice Research Institute, Los Banos, Philippines.
5. Kuetter, D. O. and Duff, J. B. (1981) IRRI Research Paper Series #59. The International Rice Research Institute, Los Banos, Philippines.