1. G. Lorentzen, Trans-critical vapor compression cycle device. International Patent Publication WO 90/07683, 1990.
2. G. Lorentzen, J. Pettersen, New possibilities for non-CFC refrigeration. In IIR International Symposium on Refrigeration, Energy and Environment, Trondheim. Norvège: Pettersen, J, 1992.
3. G. Voorhees, Improvements relating to systems of fluid compression and to compressors thereof. British Patent 4448, 1905.
4. Fundamental process and system design issues in CO2 vapor compression systems;Kim;Prog. Energ. Combust. Sci.,2004
5. Boiling heat transfer of carbon dioxide in horizontal tube;Hihara,2000