1. Report of the Refrigeration;UNEP,1994
2. New possibilities for non-CFC refrigeration;Lorentzen,1992
3. CO2 refrigeration systems in automobile air-conditioning;Wertenbach,1996
4. A high-pressure transcritical refrigeration cycle with carbon dioxide for vehicle air conditioning;Köhler,1997
5. Pointing to the future: two-stage CO2 compression;Inagaki,1997