Wang, Yuanqing, Zihua Li, and Yanan Gao. “Minimum Revenue Guarantee and Toll Revenue Cap Optimization for Ppp Highways: Pareto Optimal State Approach”. The Baltic Journal of Road and Bridge Engineering 10, no. 4 (December 27, 2015): 365–371. Accessed May 2, 2024. https://bjrbe-journals.rtu.lv/bjrbe/article/view/bjrbe.2015.46.