UNFCCC. Conference of the Parties (COP)
UNEP, 2006,Green Transport Plan for 2010 Joburg FIFA World Cup Green Transport Plan for 2010 Joburg FIFA World Cup, Washington, DC.
Department of Environment, Transport and the Regions, 2002. London City Airport Green Transport Plan, London.
Pawlak, Z, 1997, Rough set approach to knowledge-based decision support, European Journal of Operational Research, vol. 99, pp. 48-57.