Omer, Abdeen, and Abdeen Mustafa Omer. “Soil Thermal Properties and the Effects of Groundwater on Closed Loops”. International Journal of Sustainable Energy and Environmental Research 3, no. 1 (March 20, 2014): 34–52. Accessed February 4, 2026. https://www.archive.conscientiabeam.com/index.php/13/article/view/2089.