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Sim Siong, Fong and Lau, Seng and Wong Nan, Chong and Janice, Asing and Muhammad Faizal, Md Nor and Amira Satirawaty, Mohd PauzanI (2006) Characterization of the coal derived humic acids from Mukah, Sarawak as soil conditioner. Journal of the Brazilian Chemical Society, 17 (3). pp. 582-587. ISSN 0103-5053