1. H.R. Appell, Y.C. Fu, E.G. Illig, F.W. Steffgen, R.D. Miller, Conversion of Cellulosic Wastes to Oil, US Bureau of Mines, RI 8013, 1975.
2. H.G. Davis, Direct Liquefaction of Biomass, Final Report and Summary of Effort 1977–1983, Lawrence Berkeley Laboratory, LBL-16243, 1983.
3. Effect of pressure, temperature, pH, and carbon monoxide on oil yields from cellulose liquefaction
4. Proc. 2nd International Conf. on Energy from Biomass;Burton,1983
5. The production of liquid hydrocarbons by Wood hydrogenation;Boocock,1980