1. Revival of carbon dioxide as a refrigerant;Lorentzen;Int J Refrig,1994
2. Neksa P, Hrnjak P, Pettersen J, Rieberer R, Schmidt EL, Suss J. CO2 as a working fluid, short course SC3. 20th International Congress of Refrigeration, Sydney, 1999.
3. Neksa P. Transcritical vapour compression heat pumps. Proc. IIR Conf. on New Applications of Natural Working Fluids in Refrigeration and Air-Conditioning, Hannover, 1994. p. 395–404.
4. Experimental evaluation of CO2 water heater;Hwang;Refrig Sci and Technol Proc,1998
5. Yarrall MG, White SD, Cleland DJ, Kallu RDS, Hedley RA. Performance of a transcritical CO2 heat pump for the food processing industries. Proc. Natural Working Fluids '98 — IIR Gustav Lorentzen Conference, Oslo. Norway, 1998. p. 159–66.