1[2]Schneider J B,Deardorf R,Deffebach C,et al.Planning,designing and operating multi-center timed-transfer transit systems:guidelines from recent experience in six cities[OL].Seattle:Washington Univ.,1983:121.
2[3]Kato H,Itoh M,Kato S.Cost-benefit analysis for improvement of transfer at urban railway stations[C/OL].9th World Congress on Transport Research,2001.
3[4]Henry E,Kuhn F.The development of metro variants lessons from Mexico and other countries[C/OL].The French National Research Institute for Transport and Safety Research.
