1. New Developments for Underground Freight Transportation System in Korea”, Korean Society of Civil Engineers;Choi;Journal of the Korean Society of Civil Engineers,2011
2. Department for Transport [DfT-UK] (2005). Intelligent Transport Systems (ITS) - The policy framework for the roads sector. Dept. for Transport. Product Code PPU3617/ES. November 2005.
3. Department for Transport [DfT-UK] (2003). Freight Management - Traffic Advisory Leaflet ITS 10/03. DfT Traffic Advisory Unit. December 2003.
4. European Commission Directions General Energy and Transport [EC-DGTREN] (2001a): White Paper on European Transport Policy. September 2001.
5. European Commission Directions General Energy and Transport [EC-DGTREN] (2001b): Intelligent Transport Systems: Results from the transport research programme. September 2001.