Xu Y, J. Skibniewski M, Zhang Y, P. C. Chan A, F. Y. Yeung J. Developing a concession pricing model for PPP highway projects. IJSPM [Internet]. 2012Jun.19 [cited 2024Dec.23];16(2):201-17. Available from: https://jeelm.vgtu.lt/index.php/IJSPM/article/view/4853