1. Reflections on the topic of solar fuels
2. The geographical distribution of fossil fuels unused when limiting global warming to 2 °C
3. Federal Register, Regulation of Fuels and Fuel Additives: Changes to Renewable Fuel Standard Program; Final Rule. Federal Register 75, no. 58. FRL–9112–3. Book 2 of 2 Books, 2010, pp. 14669–15320
4. Directive 2009/28/EC, 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 2003/30/EC, 2009, http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32009L0028&from=en
5. OECD , The bioeconomy to 2030 – designing a policy agenda, OECD Publishing, Paris, 2009, ISBN: 978-92-64-03853-0