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Ko W.W., . (1992) Biology etiology and control of greening disease of citrus. [Proceedings Paper]
Lim W.H., . and Ko W.W., . and Mohd Shamsuddin O., . (1990) Evidence for the presence of greening disease of citrus in P. Malaysia. [Proceedings Paper]
Ko W.W., . Apple cultivation in the highlands of Malaysia. pp. 35-41. ISSN 0127-7944
Lim W.H., . and Mohd Shamsudin O., . and Ko W.W., . Citrus greening disease and alternate hosts of the vector Diaphorina citri Kuw. in P. (Peninsular) Malaysia. pp. 56-58. ISSN 0127-0192
Ko W.W., . Persimmon: a potential crop in the highlands of Malaysia. pp. 1-6. ISSN 0127-7944
Ko W.W., . Vegetative propagation techniques in citrus. pp. 33-39. ISSN 0127-7944