| 1 | 구글 인터넷 검색 http://www.nyunews.com/2013/10/24/subway-4/ http://www.pressrun.net/weblog/2013/06/singapore-mrt-more-passengers- than-expected-from-day-one.html http://www.theonlinecitizen.com/2013/03/free-mrt-transportation-solution-congestion/ |
| 2 | Graham Currie, Exploring The Impact of the 'Free Before 7' Campaign on Reducing Overcrowding on Melbournes Trains (논문) |
| 3 | Martin G. Richards(2005), Congestion Charging in London 1p, Palgrave.(단행본) |
| 4 | 유소영(2014), 도시철도 승객 혼잡완화를 위한 탄력적 요금제도 도입 분석, 철도학회 논문 |
| 5 | London Assembly(2009), Too close for comfort-Passenger's experiences of the London Underground 12p-25p(보고서) |
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