1. Global warming: impacts on the transportation infrastructure;Black;TR (Transportation Research) News,1990
2. Global warming: impacts on the transportation infrastructure;Black;TR (Transportation Research) News,1990
3. The Climate Change Action Plan;Clinton,1993
4. Green Paper on the Impact of Transport on the Environment: A Community Strategy for “Sustainable Mobility”;Commission of the European Communities,1992
5. High-Tech Highways: Intelligent Transportation Systems and Policy;Congress of the United States,1995