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Rabelo, S. , Paulino, T. , Duarte, W. , Sawalha, S. , Machado, L.. "Experimental Analysis of the Influence of Water Mass Flow Rate on the Performance of a CO2 Direct-Expansion Solar Assisted Heat Pump ". World Academy of Science, Engineering and Technology, Open Science Index 139, International Journal of Chemical and Molecular Engineering, (2018), 12(7), 327 - 331.