1. Airline deregulation, safety, and profitability in the US;Adrangi;Transport. J.,1997
2. Astrop, A., Balcombe, R.I, Finch, D.I., 1991. Bus Safety and Maintenance Following Deregulation. Research Report 337. Transport and Road Research Laboratory, Crowthorne, Berkshire.
3. Airline safety: the last decade;Barnett;Manage. Sci.,1988
4. Deregulierung und Sicherheit im Strassenguterverkehr;Baum,1997
5. The safety effects of mode shifting following deregulation;Boyer,1989