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Ooi S.H., . and Woo Y.C., . and Leng K.Y., . Yield maximization and conservation in tree crop agriculture with special reference to oil palm and cocoa. pp. 501-519.
Mutert E., . and Woo Y.C., . and Beaton J.D., . (1994) Use of phosphate and potassium in tropical crop production. [Proceedings Paper]