1. Plan van Aanpak Schiphol en Omgeving, Staatsdrukkerij, the Hague, 16 April 1992.
2. Premises for risk management, Lower House of the States General, session 1988–1989, 21137 nr 1–2, SDU, The Hague.
3. Department of Transport (UK), Civil Aviation Policy 1, 25 January 1993.
4. Technica, Risk Analysis of Aircraft Impacts at Schiphol Airport, London, 1990, No. 1884/EJS/ib.
5. Technica, Extension to Risk Analysis of Aircraft Impact at Schiphol Airport, London, 1991, No. C2475/EJS.