1. Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 003/30/EC 2009
2. Fossil Freedom on the road. Part 2 [Fossilfrihet på väg. Del 2. SOU 2013:84; in Swedish] 2013 http://www.regeringen.se/contentassets/7bb237f0adf546daa36aaf044922f473/fossilfrihet-pa-vag-sou-201384-del-22
3. Börjesson P Lundgren J Ahlgren S Nyström I Production of today's and future sustainable biofuels [Produktion av dagens och framtidens hållbara biodrivmedel; in Swedish] 2013 http://www.f3centre.se/sites/default/files/f3_borjesson_et_al_dagens_och_framtidens_hallbara_biodrivmedel__slutversion_rev_130620.pdf
4. Ekbom T Gåverud H Rehnlund B Market conditions for biofuels - competitiveness for SNG in relation to alternative renewable transportation fuels [Marknadsförutsättningar för biodrivmedel - Konkurrenskraft för SNG i förhållande till alternativa förnybara drivmedel; in Swedish] 2012
5. Isaksson J Biomass gasification-based biorefineries in pulp and paper mills - greenhouse gas emission implications and economic performance 2015