1. IEA, “Global Energy Review 2021,” Paris, 2021. [Online]. Available: https://www.iea.org/reports/global-energy-review-2021.
2. E. I. Administration, “International Energy Outlook 2021,” 2021.
3. Alboudwarej H, Felix J, Taylor S, Badry R, Bremner C, B. B. B, “Highlighting Heavy Oil ” vol. 2, 2006.
4. IEA, “World Energy Outlook 2020,” IEA, Paris, 2020. [Online]. Available: https://www.iea.org/reports/world-energy-outlook-2020.
5. Dusseault M, “Comparing Venezuelan and Canadian Heavy Oil and Tar Sands,” In Canadian International Petroleum Conference Calgary, AB, Canada, 2001: Petroleum Society.