1. House heating with earth heat-pump;Grandall;Electrical World,1946
2. Theory of the ground pipe heat-source for the heat pump;Ingersoli;Heating, Piping, Air Conditioning Journal,1948
3. Thermal enhancement of bentonite grouts for vertical GSHP systems;Remund,1995
4. Ground-source heat-pump designs for geothermal systems for commercial and institutional buildings;Kavanaugh,1997
5. The use of ground-coupled tanks in solar-assisted heat-pump systems;Metz;ASME Transactions, Journal of Solar Energy Engineering,1982