Christensen, L. T., and C. Greve. “Choosing State Owned Enterprises over Public-Private Partnerships for Infrastructure Governance: Explaining Institutional Change With Evidence from Denmark’s Transport Sector”. International Public Management Review, vol. 18, no. 1/2, Dec. 2018, pp. 137-61, https://ipmr.net/index.php/ipmr/article/view/298.