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2. American Embassy Jakarta, 2000. Coal Sector Report Indonesia 2000. Embassy of the United States of America, Jakarta.
3. Brekke, K., 2005. American Coalition for Ethanol Releases Results of Fuel Economy Study. American Coalition for Ethanol 〈http://www.ethanol.org/documents/ACEFuelEconomyStudy.pdf〉.
4. BRW (Burn and Roe Worley Pty. Ltd.), 2003. Feasibility Study of Rice Husk Power Plant Project.
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