Prof. Dr.-Ing. Klaus Richter, and Jonas Baumann. “From Vision to Verdict: A Longitudinal Analysis of Cost Escalation and Risk Management in the Stuttgart 21 Megaproject”. International Journal of Economics Finance & Management Science, vol. 10, no. 09, Sept. 2025, pp. 1-13, https://scientiamreearch.org/index.php/ijefms/article/view/171.