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Ooi H.S., . Adaptation of a pulling machine for stump extraction on peat in Malaysia. -.
Ooi H.S., . Jentera serbaguna untuk padi. 3-. ISSN 0127-1458
Ooi H.S., . Performance of modified Kubota Carrier RC20P and Porter P6-121 on peat soil in Malaysia. -.
Ooi H.S., . and Hamdan A.M., . Potential of modified porter P6-121 in pineapple estate in Malaysia. -.