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Chew T. A., . and Mohd. Yusof Shahabuddin, . Measuring productivity/efficiency in rubber estates: a frontier cost function approach. pp. 303-314. ISSN 0127-7065
Mohd. Napi Daud, . and Mohd. Yusof Shahabuddin, . A statistical forecast of rubber prices. pp. 69-80. ISSN 0127-7065