CML (Institute of Environmental Sciences, Leiden University) 2008: Greenhouse gas calculator for electricity and heat from biomass; Van der Voet, E. et al.; CML rapport 179; Leiden University
http://www.leidenuniv.nl/cml/ssp/publications/co2_tool.pdf, http://www.leidenuniv.nl/cml/ssp/publications/co2_tool_annexes.pdf, http://www.leidenuniv.nl/cml/ssp/publications/co2_tool_software.zip