8Grimsey,Darrin,Lewis,Mervyn K.The Economics of public private partnerships. . 2005
9Savas ES.Privatization and Public-Private partnerships. . 2000
10Bon-Gang Hwang,Xianbo Zhao,Mindy Jiang Shu Gay.??Public private partnership projects in Singapore: Factors, critical risks and preferred risk allocation from the perspective of contractors(J)International Journal of Project Management . 2012