1. Copper, its effects on the growth of the rubber plant (Hevea brasiliensis);BOOLE-JONES E.W.;Plant and Soil,1957
2. Efeito do Al sobre o desenvolvimento, absorção e translocaçao de nutrientes pela seringueira (Hevea brasiliensis) em solução nutritiva;CARVALHO J.G.de
3. Differential aluminum and manganese tolerance of plant species and varieties in acid soils;FOY CD;Ciência e Cultura,1976
4. The -plant root and its environment;FOY CD,1971
5. Rates of extraction of potassium and aluminum from five Malaysian soils by a cation exchange resin;LAU C.H.;Journal of the Rubber Research Institute of Malaysia,1979