Ahmed, F. M., and E. M. Abdullah. “Comparison Between Nelson-Olson Method and Two-Stage Limited Dependent Variables (2SLDV ) Method for the Estimation of a Simultaneous Equations System (Tobit Model)”. Journal of Economics and Administrative Sciences, vol. 27, no. 130, Dec. 2021, pp. 210-26, doi:10.33095/jeas.v27i130.2212.