1. China statistical yearbook 2011;National Bureau of Statistics of China,2011
2. 2010 Annual Report of China urban mass transit;Research Group of the Annual Report of China Urban Mass Transit,2010
3. Traction energy cost reduction of the WMATA Metrorail system;Uher;IEEE Trans Ind Appl,1984
4. Chui A, Li KK, Lau PK. Traction energy management in KCR. IEE Conference Publication, vol. 1(388); 1993. p. 202–8.
5. Hickman J, Hassel D, Joumard R, Samaras Z, Sorenson S. Methodology for calculating transport emissions and energy consumption. Luxembourg: Office for Official Publications of the European Communities; 1999.