1. Rensfelt, E. Gasification for Power Production. 1st European Forum on Electricity Production from Biomass and Solid Wastes by Advanced Technologies. Florence, Italy. 27–29 November 1991.
2. Koljonen, J. and Kurkela, E., Experiences in the Operation of the HTW process at the Peat Plant of Kemira Oy. Low grade fuels. VTT Symposium 107. Espoo, Finland. 1990.
3. Kurkela, E. et al, Removal of Particulates and Alkali Metals from Pressurised Fluid-bed Gasification of Peat and Biomass-gas Clean-up for Gas Turbine Applications. Proceedings of Energy from Biomass and Wastes XV. Washington DC, USA. 25–29 March 1991.
4. Solantausta, Y., et al. Combined Cycle Power Production from Biomass. Proceedings of Energy from Biomass Contractors Meeting. Florence, Italy. 20–22 Nov, 1990. Ed. P Grassi, P Monchada, H. Zibetha. Commission of the European Communities.
5. Aldén, H. et al, Conversion of Tar in Woodgas using a Fixed Dolomite Bed. Research in Thermochemical Biomass Conversion. Phoenix, USA. 2–6 May 1988.