1. Japan Fluorocarbon Manufactures Association (JFMA), The data of environmental impact and safeness of fluorocarbons (in Japanese), Tokyo.
2. Japan Refrigeration and Air Conditioning Industry Association (JRAIA), Fluorocarbon Committee, Fluorocarbon Recovering and Recycling Working Group. The Investigative report on fluorocarbon consumption in refrigerant use and feasibility of recovery (in Japanese), Tokyo; 1993.
3. New Energy and Industrial Technology Development Organization (NEDO). The investigative report on the trend of alternative fluorocarbons as measures for mitigating global warming (in Japanese). NEDO-GET-9602. 109–113, Tokyo; 1997.
4. Japan Vending Machine Manufactures Association (JVMA). Vending machine report. Vend (in Japanese), vol. 2, Tokyo; 1998. p. 18.