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Zainol M. E., . and Mahmud A. W., . and Mohd. Noor S., . Effects of intercropping systems on surface processes in an acid ultisol 2. Changes in soil chemical properties and their influence on crop performance. pp. 124-136. ISSN 0127-7065
Mohd Faizal K., . and Abdul Halim T, . and Mahmud A. W., . and Mohd Ilham A, . and Mohd Khafi J, . (2000) Penanaman Tongkat Ali secara terbuka: satu kajian awal. [Proceedings Paper]
Tong V.T., . and Sharifuddin H.A.H., . and Zaharah Abdul Rahman, . and Yusof M. N., . and Mahmud A. W., . (1998) Nitrogen contribution by slow-release fertilizers to rubber Hevea brasiliensis seedlings. [Proceedings Paper]