1. Translator, Code of Hammurabi, http://www.yale.edu/lawweb/avalon/medieval/ hammenu.htm, accessed February 2, 2006.
2. Canterbury tales, http://classiclit.about.com/library/bl-etexts/gchaucer/bl-gchau-can-can. htm, accessed February 2, 2006.
3. A guide to hazard and operability studies, Chemical Industries Association, London, 1977.
4. Rijnmond Public Authority, Risk analysis of six potentially hazardous industrial objects in the Rijnmond area: A pilot study, 1982.