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Rajanaidu N., . and Abdul Azis Ariffin, . and Wood B.J., . and Sarjit Singh, . (1988) Ripeness standards and harvesting criteria for oil palm bunches. [Proceedings Paper]
Sarjit Singh, . The use of electrical drills for more efficient trunk injection against bagworms in oil palms Elaeis guineensis. pp. 54-57. ISSN 0126-575X