Sabeeh Abed-Alkareem, Salah. “Power Plant Waste Heat Utilization for Soil Heating Using Subsurface Pipes”. Journal of Engineering and Sustainable Development, vol. 16, no. 1, Mar. 2012, pp. 273-86, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1178.