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2. Historical developments in hydroprocessing bio-oils;Elliott;Energy and Fuels,2007
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4. Consider upgrading pyrolysis oils into renewable fuels;Holmgren;Hydrocarbon Processing,2008
5. Elliott, D.C.,Hart, T.R.,Hu, J., & Neuenschwander, G.G.( 2008). Palladium catalyzed hydrogenation of bio-oils and organic compounds, U.S. Patent No. 7,425,657, September 16.