1. Allport RJ. Improving Decision-making for Major Urban Rail Projects, 2008, University of London, PhD thesis.
2. Operational risk: the focus for major infrastructure?
3. Ardila A. Transit Planning in Curitiba and Bogotá: Roles in Interaction, Risk and Change, 2004, Massachusetts Institute of Technology, PhD thesis.
4. Babalik E. Urban Rail Systems: a Planning Framework to Increase their Success, 2000, University of London, PhD thesis.