1. Bohnenblust H. and Fermaud Ch. (1993) The Appraisal of Risks in the Rail Industry, Dresden, Paper presented to the Annual Meeting of the German Association of Rail Engineers, November (in German)
2. Deutsche Balm AG (1994) Risk Minimization in the Transportation of Hazardous Materials, Ernst Basler and Partners Ltd. (in German)
3. Deutsche Bundesbalm/Zentralamt München (1986) Safety Requirements at Grade Crossings, Ernst Basler and Partners Ltd. (in German)
4. Kraus N. and Slovic P. (1988) Taxonomic Analysis of Perceived Risk, in: RiskAnalysis, 8 (3)
5. Merz H., Schneider Th. and Bohnenblust H. (1995) The Appraisal of Technological Risk,vdf Verlag der Fachvereine, Zürich (in German)