1. Effect of trees on the yield of wheat crop;Akbar;Agroforestry Systems,1990
2. Tropical Soil and Fertility: A Handbook of Methods;Anderson,1993
3. Acacia nilotica: a traditional forage species among the Afar of Djibouti;Audru,1992
4. Leaching accumulation and release of nitrogen in decomposing forest litter;Berg;Ecology Bulletin,1981
5. Changes in organic chemical components and in growth of fungal mycelium in decomposing birch leaf litter as compared to pine needles;Berg;Pedobiological,1984