1. The Smart Guide to Geothermal: How to Harvest Earth’s Free Energy for Heating & Cooling;Loyd,2011
2. Development of high efficiency and instantaneous heat-pump water heating system using R410A;Gommori;Reito Journal (JSRAE),2004
3. R410A heat pump hot water supply system for commercial use;Okoshi;Reito Journal (JSRAE),2004
4. CO2-heat pump water heater: characteristics, system design and experimental results;Nekså;Int. J. Refrig.,1998
5. Economical Heating and Cooling Systems for Low Energy Houses;IEA HPP Annex 32,2011