حسين سجى محمد, and عكار احمد عبدعلي. “Some Estimation Methods for the Two Models SPSEM and SPSAR for Spatially Dependent Data”. Journal of Economics and Administrative Sciences, vol. 25, no. 113, Aug. 2019, pp. 499-25, https://doi.org/10.33095/jeas.v25i113.1710.