8Li B, Akintoye A, Edwards P J, Hardcastle C, The allocation of risk in PPP/PFI construction projects in the UK[J]. International Journal of Project Management, 2005, 23 ( 1 ): 25-35.
9Eduardo Engel, Ronald Fischer, Alexander Galetovic. Soft Budgets and Renegotiation in Public-private partnerships [R]. National Bureau of Economic Research, 2009.
10Guasch, J. L., Laffont J. J. and Straub S. Concessions of Infrastructure in Latin America: Government-led Renegotiations[J]. Journal of Applied Econometrics, 2007, 22 ( 7 ): 1267-1294.