Feng, Ke, Shouqing Wang, Nan Li, Chunlin Wu, and Wei Xiong. “Balancing Public and Private Interests through Optimization of Concession Agreement Design for User-Pay PPP Projects”. Journal of Civil Engineering and Management 24, no. 2 (March 30, 2018): 116-129. Accessed April 23, 2024. https://journals.vilniustech.lt/index.php/JCEM/article/view/455.