- Bacon, P.E. eta/. (1986). Soi/Bio/. Biochem., 18: 173-178.
- Larson, W.E. and Clapp, C.E. (1984). In: Organic Matter and Rice. IRRI, Los Banos, Philippines, P: 363-385.
- Mew, TW and Rosales, A.M. (1983). In: Proc. 511l Intern. Congo Plant Pathology, Aug. 17-25. Canbarra, Australia. P, 34-35
- Nakada, H. (1980). Shiga Agric. &pt. Sm. Bul/., 13: 8-13.
- Shanmugasundaram, V.S. eta/. (1975).. MadrasAgric. J.,.62: 353~356.
- Takekawa, M. and Moriwaki. R. (1980). Bu//. HokkaidoPrefectua/ Agric. Exp!. Stn., 44:79-89.
- Verma, S. and Mathur, R.S. (1990). BiD/. Wastes, 3: 9-16.