1. Energy efficiency strategies for freight trucking: Potential impact on fuel use and greenhouse gas emissions;Ang-Olson;Transportation Research Record,2002
2. Bundesamt für Güterverkehr, 2005. Marktbeobachtung Güterverkehr, Sonderbericht zum Strukturwandel im Güterkraftverkehrsgewerbe. Köln.
3. European Environment Agency, 2006. Transport and environment: Facing a dilemma; TERM 2005: Indicators tracking transport and environment in the European Union. EEA Report 3/2006, Copenhagen.
4. European Commission, 2006. The annual energy and transport review for 2004. Office for Official Publications of the European Communities, Luxembourg.
5. The application of information and communication technologies in transport;Giannopoulos;European Journal of Operational Research,2004