1. Awad MM, Mostafa HM, Sultan GI, Elbooz A, El-ghonemy AMK (2007) Performance Enhancement of Air-cooled Condensers. Acta Polytechnica Hungarica 4(2)
2. Bjorn P (2007) Refrigeration systems with minimum charge of refrigerant. Appl Therm Eng 27(9):1693–1701
3. Calm JM (2008) The next generation of refrigerants -Historical review, considerations and outlook. Int J Refrig 31:1123–1133
4. Cavallinia A, Censi G, Del Col D, Dorettia L, Longo GA, Rossetto L, Zilio C (2003) Condensation inside and outside smooth and enhanced tubes—a review of recent research. Int J Refrig 26(19):373–392
5. Chunfang Tanga, Qinghi Luob, Xiangmei Lib, Xiaojuan Zhua (2007). Refrigeration drives sustainable development, state of the art, 20th anniversary of the Montreal Protocol, 10th anniversary of the Kyoto Protocol, International Institute of Refrigeration (IIR)