S. Ahmed, A. H. Memon, N. A. Memon, A. N. Laghari, M. A. Akhund, and H. U. Imad, “Common Factors of Cost Escalation in Construction Industry of Pakistan”, Eng. Technol. Appl. Sci. Res., vol. 8, no. 6, pp. 3508–3511, Dec. 2018.