Nosair, I. A. R., A. H. Hosny, M. A. El-Mikawi, and H. E.-D. M. Bahaa. “Modeling System to Support the Determination of the Return on Investment (ROI) for PPP Projects in Egypt”. Resourceedings, vol. 1, no. 2, Nov. 2018, pp. 17-30, doi:10.21625/resourceedings.v1i2.320.