1. Heat storage in clay;Adolfson,1985
2. A design method for parallel solar—Heat pump system;Anderson;Solar Energy,1980
3. Remote prediction of ground temperature in Australian soils and mapping its distribution;Bags;Solar Energy,1983
4. Bakema G, Snijders A, and Nordell B (1995) Underground Thermal Energy Storage, State of the Art 1994. IEA Energy Storage Programme Report, IF Technology.
5. Energetic and financial evaluation of solar assisted heat pump space heating systems;Bellos;Energy Conversion and Management,2016