1. CO2-heat pump water heater;Nekså;Int. J. Refrigeration,1998
2. Nekså P, Dorin F, Rekstad H, Bredesen AM, Serbisse A. Development of semi-hermetic CO2-compressors. 20th International Congress of Refrigeration, IIR/IIF, Sydney, 1999.
3. Pettersen J, Nekså P, Nesje OM, Schiefloe PA, Rekstad H. Recent advances in CO2 refrigeration. 19th IIR Congress of Refrigeration, IIR/IIF, Haag, The Netherlands, 1995.
4. Dorin F. Semi-hermetic CO2 compressors for commercial applications. In: CO2 technology in refrigeration, heat pump and air conditioning systems. Mainz, Germany, 1999.
5. Bredesen AM, Aflekt K, Pettersen J, Hafner A, Nekså P, Skaugen G. Studies on CO2 heat exchangers and heat transfer. In: CO2 technology in refrigeration, heat pumps and air conditioning systems. Trondheim, Norway. IEA Heat Pump Centre, 13–14 May, 1997.