[1] G. Baldi, T. Hueckel, R. Pelegrini, Thermal volume changes of the mineral-water system in low-porosity clay soils. Canadian Geotechnical Journal, 25(4) 1988, 807–825.
[2] P. Bourne-Webb, B. Amatya, & K. Soga, A framework for understanding energy pile behavior. Proceedings of the Institution of Civil Engineers Geotechnical Engineering, 2013.
[3] H. Brandl, Energy foundations and other thermo-active ground structures. Geotechnique, 56(2) 2006, 81-122.
[4] C. Cekerevac and L. Laloui, Experimental study of thermal effects on the mechanical behavior of a clay. International Journal for Numerical and Analytical Methods in Geomechanics, 28(3) 2004, 209–228.
[5] G. Dorn, World Geothermal Energy Production Nearing Eruption Earth Policy Institute. Retrieved December 20, 2008.
[6] Energy and Geosciences Institute, University of Utah. Prepared by the U.S. Geothermal Industry for the Renewable Energy Task Force, Briefing on Geothermal Energy. Washington, D.C. 1997.
[7] C. Knellwolf, H. Peron, L. Laloui, Geotechnical analysis of heat exchanger piles, Journal of Geotechnical and Geoenvironmental Engineering 137(10) 2011, 890–902.
[8] L. Laloui, and A. Di Donna, Energy Geostructures. Innovation in Underground Engineering. ISTE Ltd, London, 2013.
[9] L. Laloui, M. Nuth, M. Vulliet, Experimental and numerical investigations of the behavior of a heat exchanger pile. Int J Numer Anal Methods Geomech, 30(8) 2006, 763-781.
[10] J.W. Lund, T.L. Boyd, Direct utilization of geothermal energy 2015 worldwide review, Geothermics. 60 2016, 66–93.
[11] K.D. Murphy, J.S. McCartney, Thermal Borehole Shear Device, Geotechnical Testing Journal 37(6) 2014, 1040-1055.
[12] S.J. Rees, An introduction to ground-source heat pump technology, Advances in Ground-Source Heat Pump Systems. Woodhead Publishing, 2016. 1-25.
[13] S.W. Rees, M.H. Adjali, Z. Zhou, M. Davies, & H. R. Thomas, Ground heat transfer effects on thermal performance of earth contact structures, Renewable and Sustainable Energy Reviews, 4(3) 2000, 213-265.
[14] T.P. Suckling, P.E.H. Smith, Environmentally friendly geothermal piles at Keble College, Proceedings of the 9th Conference on piling and deep foundations, 2002, 445-452.