1. Laboratory Methods of Testing Fans for Rating;ANSI/AMCA 210,1985
2. Engineering Analysis of Experimental Data;ASHRAE Guideline 2,1986
3. Methods of Testing for Seasonal Efficiency of Unitary Air-conditioner and Heat Pumps;ASHRAE Standard 116,1993
4. Two-stage air-source heat pump for residential heating and cooling applications in northern U.S. climates;Bertsch;International Journal of Refrigeration,2008
5. Effects of gas injection on the heating performance of a two-stage heat pump using a twin rotary compressor with refrigerant charge amount;Heo;International Journal of Air-conditioning and Refrigeration,2008