1. Chapter I: rationale for forest energy production. Bioenergy from sustainable forestry;Eriksson,2002
2. Ecological assessment of integrated bioenergy systems using the sustainable process index;Krotscheck;Biomass and Bioenergy,2000
3. Hakkila P. Developing technology for large-scale production of forest chips. Wood Energy Technology Programme 1999–2003. Interim report, Tekes. Technology Programme Report 5/2003. ISBN 952-457-101-3, 2002.
4. Baltic 21—Energy Sector. Joint action 1. Increased production and use of bioenergy and other renewable energy. Prepared by Danish Technological Institute and Energy Consulting Network; 2001. 41pp.
5. Environmental sustainability of forest energy production. Bioenergy from sustainable forestry;Raison,2002