1. Fluid to duct wall heat transfer in duct system heat storages;Mogensen,1983
2. Eklöf C, Gehlin S. TED—a mobile equipment for thermal response test. Master’s thesis 1996:198E. Sweden: Luleå University of Technology; 1996.
3. Thermal response test—a mobile equipment for determining thermal resistance of borehole;Gehlin,1997
4. Austin WA. Development of an in-situ system for measuring ground thermal properties. Master’s thesis. Stillwater, OK: Oklahoma State University; 1998.
5. Hellström G. Ground heat storage. Thermal analysis of duct storage systems. Part I theory. Lund, Sweden: Department of Mathematical Physics, University of Lund; 1991. p. 148–54.