1. Aloisi, A., 2007. De' Longhi, private communication.
2. ARTA, 2007. Available from: http://www.nh3tech.org/ones.html.
3. CCOHS, 2007. http://www.worksafesask.ca/files/ccohs/cheminfo/cie48.htm/files/ccohs/cheminfo/cie48.html citing Compressed Gas Association, 1990. Handbook of Compressed Gases, third ed., Van Nostrand Reinhold Company, pp. 231–252.
4. Performance and heat transfer characteristics of hydrocarbon refrigerants in a heat pump system;Chang;International Journal of Refrigeration,2000