1. Appliance Industry Data, American Home Appliance Manufacturers, Chicago, IL, USA (1989)
2. Polyurethanes in refrigeration ICI Corporation Publication PU620-1 E
3. Performance of alternative chlorofluorocarbons in rigid urethane appliance foams;Dietrich,1988
4. DuPont has substitute to help ozone;Arndt;Chicago Tribune,1989
5. The search for alternative refrigerants-a molecular approach;McLinden,1988