1. Growth performance of some multipurpose trees and shrubs in the semi-arid areas of Southern Ethiopia;Abebe;Agroforestry Systems,1994
2. Amara, D.S., 1990. The potential of nitrogen fixation trees for Agroforestry in Sierra Leona. In: Werner, D., Muller, P. (Eds.), Fast Growing Trees and Nitrogen Fixation Trees. Gustav Fischer, Stuttgart/New York, pp. 273–275
3. Nodulation and nitrogen fixation in extreme environments;Bordeleaue;Plant Soil,1994
4. Brewbaker, J.L., 1987. Significant nitrogen fixing trees in Agroforestry systems. In: Gholz, H.L. (Ed.), Agroforestry: Realities, Possibilities and Potentials. Martinus Nijhoff, Dordrecht, The Netherlands, pp. 31–35
5. Effect of acid soils on nodule-forming bacteria;Bryan;Soil Sci.,1923