- Carter, J.M., et al. (1994 Aust .Agric. Res., 45:613-623.
- Clarke, L.M., et al.(1993). Soil Biol . Biochem., 25 : 1289-1291.
- Dashti, N., et al. (1997). Plant Soil . 188:33-41.
- Ibekwe, A.M., et al. (1997). Agric. Ecosyst. Environ. 61:103-111.
- Kamble ,P.U., et al. (2000). J. Soils and Crops, 10 :217-220.
- Lindstrom,K., et al. ( 1985). Plant Soil, 87: 293-302.
- Prabakaran, J., et al. (1996). 37th Annual Conference of the Association of Microbiologists of India, IIT, Chennai. Dec.4-6,p.120.
- Soumya,V.I., (2001). M.Sc. (Ag.) Thesis, Tamilnadu Agricultural University, Coimbatore, India.
- Taylor, R.W. et al.(1991). Plant Soil, 131:293 – 300.
- Van Rossum D., et al. (1994).Plant Soil, 163:165-175.