1. LPG Integral, TNO Apeldoorn, Netherlands, 1983.
2. LPG Integral Memorandum, Netherlands, Staatsuitgeverij Den Haag, 1984.
3. Report on the COVO study to the Rijnmond Authority, Reidel Publ., Netherlands, 1970.
4. Council Directive 82/501/EC on the major-accident hazards of certain industrial activities, Commission of the European Communities, 1982.
5. Besluit LPG tankstations, Staatsblad 95, 1988.