Yun, Sungmin, Wooyong Jung, Seung Heon Han, and Heedae Park. 2015. “Critical Organizational Success Factors for Public Private Partnership Projects – a Comparison of Solicited and Unsolicited Proposals”. Journal of Civil Engineering and Management 21 (2):131-43. https://doi.org/10.3846/13923730.2013.802715.