1. Reforming Energy Subsidies: Opportunities to Contribute to the Climate Change Agenda (UNEP, 2008);
www.unep.org/pdf/pressreleases/reforming_energy_subsidies.pdf
2. Untold Billions: Fossil-Fuel Subsidies, Their Impacts and the Path to Reform (GSI, 2009).
3. Joint report by IEA, OPEC, OECD and World Bank on Fossil-Fuel and Other Energy Subsidies: An Update of the G20 Pittsburgh and Toronto Commitments (IEA, OPEC, OECD & World Bank, 2011);
www.oecd.org/site/tadffss/49006998.pdf
4. World Energy Outlook 2014 (IEA, 2014).
5. Davis, L. W. The Economic Cost of Global Fuel Subsidies (National Bureau of Economic Research, 2013);
http://ideas.repec.org/p/nbr/nberwo/19736.html