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2. Contribution of internal heat exchanger to transcritical R744 cycle performance;Boewe;International Journal of Heating, Ventilating, Air-Conditioning and Refrigerating Research,2001
3. Two-stage trans-critical carbon dioxide cycle optimization: a theoretical and experimental analysis;Cavallini;International Journal of Heating, Ventilating, Air-Conditioning and Refrigerating Research,2005
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5. ISO 917 1989-09-15. Optimization for Standarization. Testing of Refrigerant Compressors.