1. Sixth Energy Congress of Turkey. World Energy Council – Turkish National Committee (WECTNC), İzmir, 1994. Energy Statistics, 1994
2. Biomass resources for energy and chemical industry;Demirbaş;Energy Edu Sci Technol,2000
3. Recent advances in biomass conversion technologies;Demirbaş;Energy Edu Sci Technol,2000
4. Solvent fractionation of humic acids from Central Anatolian lignites;Kara;Energy Edu Sci Technol,1998
5. Fractionation of coal extracts obtained from supercritical gas extraction;Yazıcıgil;Energy Edu Sci Technol,2001