1. Allen JC and Barnes DF (1984) The causes of deforestation in developing countries. Assoc Am Geogr 22:163?184
2. Burnett GN (1985) Kenya's forests: going up in smoke. Western Wildlands 11:25?27
3. Buschbacher RJ (1986) Tropical deforestation and pasture development. BioScience 36:22?28
4. Forestry Research centre (1986) Growth of some forest trees in Ethiopia and suggestions for species selection in different climatic zones. Research Note 2. Addis Ababa, Ethiopia
5. Campbell CD (1989) The importance of root interactions for grass and tree in a silvo-pastural system. Aspects Appl Biol 22:255?261