1. US National Commission on energy policy, ending the energy stalemate – A.
2. Laherrere J. Forecast of oil and gas supply to 2050. Petrotech 2003, New Delhi; 2003.
3. Davis G. Energy security and sustainability. UNECE Sustainable Energy Committee, Geneva, November 20, 2002.
4. Isaacs E. Canadian oil sands: development and future outlook. Alberta Energy Research Institute, 2004. .