1. Factors affecting the performance of a residential air-to-air heat pump;Parken;ASHRAE Transactions,1977
2. Heat pump development and potential growth in Western Europe;Tassou;Energy World, Heat Pumps Supplement,1981
3. Heat pump cyclic performance and its influence on seasonal operation;Bullock,1978
4. A new approach to compressor capacity modulation;Cheney,1974
5. Infinitely variable capacity control;White,1974