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Sim Siong, Fong and Lau, Seng and Haslinda, Mat (2007) Reuse of nitric acid in the oxidative pretreatment step for preparation of humic acids from low rank coal of Mukah, Sarawak. Journal of the Brazilian Chemical Society, 18 (1). pp. 41-46. ISSN 0103-5053
Sim Siong, Fong and Lau, Seng and Norrafidah, Majri and Haslinda, Mat (2007) A comparative evaluation on the oxidative approaches for extraction of humic acids from low rank coal of Mukah, Sarawak. Journal of the Brazilian Chemical Society, 18 (1). pp. 34-40. ISSN 0103-5053
Haslinda, Mat (2006) Reuse of nitric acids in the oxidative pretreatment step for the production of nitrohumic acids. [Final Year Project Report] (Unpublished)