1. International Energy Outlook
2016, https://www.eia.gov/outlooks/ieo/pdf/0484(2016).pdf (accessed May 2016).
2. Beach, F. Leveraging Natural Gas to Reduce Greenhouse Gas Emissions. https://www.c2es.org/site/assets/uploads/2013/06/leveraging-natural-gas-reduce-ghg-emissions.pdf (accessed June 2013).
3. Economic feasibility of heat pumps in distillation to reduce energy use
4. Bruinsma, D.; Spoelstra, S. Heat Pumps in Distillation. In Distillation & Absorption Conference, Eindhoven, The Netherlands, September 12–15, 2010.