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2. U. Sonesson, Energianalyser av biobränslen från höstvete, raps och salix. Energy analysis of biofuels from winter wheat, rapeseed and salix. Report 174, Swedish University of Agricultural Sciences, Department of Agricultural Engineering, Uppsala, 1993. (In Swedish with English summary)
3. Non-food-tutkimuksen linjat 1995–2000. (Guide-lines for non-food research 1995–2000) Finnish Ministry of Agriculture and Forestry. Working Group of Non Food Research. Työryhmämuistio MMM, 1995. (In Finnish)
4. NUTEK, Forecast for Biofuel Trade in Europe. The Swedish Market in 2000, Vol. 10. NUTEK, Swedish National Board for Industrial and Technical Development, B, 1993
5. S. Wallenius and R. Seppänen, Maatalouden rakennekehitys ja ympäristönäkökohdat. Hyvinvointikatsaus 2/1995, 1995, pp. 41–43. (In Finnish)