1. Abbott L K and Robson A D 1977 Growth stimulation of subterranean clover with vesicular-arbuscular mycorrhizas. Aust. J. Agric. Res. 28, 639–649.
2. Bowen G D 1980 Mycorrhizal roles in tropical plants and ecosystems.In Tropical Mycorrhiza Research. Ed. Mikela. Clarendon Press, Oxford. pp 165–189.
3. Bowen G D and Smith S E 1981 The effect of mycorrhizas on nitrogen uptake by plants. Ecol. Bull. 33, 237–247.
4. Burckhardt E A and Howeler R H 1984 Efecto de micorrizas en el crecimiento de la yuca, estudiado en ensayos de invernadero. Suelos Ecuatoriales 14, 158–165.
5. Centro Internacional de Agricultura Tropical (CIAT), 1978 Annual Report 1977.