ghazi, kovan T., and bahram M. saleh. “Estimation of the Demand Function of Electrical Energy for the Domestic Sector in Duhok Governorate and Forecasting until Year 2019”. Humanities Journal of University of Zakho, vol. 6, no. 2, June 2018, pp. 549-61, doi:10.26436/hjuoz.2018.6.2.258.