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Teoh K.C., . and Chan W.H., . and Ooi L.H., . Effect of palm oil sludge cake on early growth of newly planted oil palm Elaeis guineensis rubber Hevea brasiliensis and cocoa Theobroma cacao in the field Malaysia. pp. 368-382. ISSN 0126-575X
Tan K.S., . and Ooi L.H., . (2002) Impact of the mini-tractor grabber on soil-physical properties. [Proceedings Paper]