1 정헌영, "도시철도의 노인무임수송정책 개선에 관한 고찰" 대한교통학회 32 (32): 256-265, 2014
2 Kim,S.G., "Urban railway free transport welfare system improvement and development direction" 3-, 2017
3 Park,J.S., "The problem and the solution deduction of railroad free-ride" The Korean Society for railway 698-709, 2016
4 Lee,S.K., "Status and Problems of Urban Railway-free Transportation, BDI policy focus" 1-8, 2010
5 Park,J.S., "Railway traffic engineering" CHONG MOON GAK 2017
6 Son,K.H., "Problems of the Free-Ride Policy and User'Perception" The Graduate School of Urban Sciences, University of Seoul 2015
7 Kang.G.H., "Problems and Solutions of Urban Railway-Free Transportation System" The Korean Society for railway 9 (9): 34-38, 2006
8 Ji,Y.S., "Improvement offree- ridingon theurban railway - Focusing on the Seoul Metro-" The Korean Society for railway 738-743, 2015
9 Lee,C.H., "Analysis of the Elderly Travel behavior with Using Transportation card data" The Korean Society for railway 1527-1530, 2014
10 Joh,S.W., "A Study on the improvement of the urban railway free ride program" Dept. of Railroad Sysstem Engineering The Graduate School of Engineering 2016
1 정헌영, "도시철도의 노인무임수송정책 개선에 관한 고찰" 대한교통학회 32 (32): 256-265, 2014
2 Kim,S.G., "Urban railway free transport welfare system improvement and development direction" 3-, 2017
3 Park,J.S., "The problem and the solution deduction of railroad free-ride" The Korean Society for railway 698-709, 2016
4 Lee,S.K., "Status and Problems of Urban Railway-free Transportation, BDI policy focus" 1-8, 2010
5 Park,J.S., "Railway traffic engineering" CHONG MOON GAK 2017
6 Son,K.H., "Problems of the Free-Ride Policy and User'Perception" The Graduate School of Urban Sciences, University of Seoul 2015
7 Kang.G.H., "Problems and Solutions of Urban Railway-Free Transportation System" The Korean Society for railway 9 (9): 34-38, 2006
8 Ji,Y.S., "Improvement offree- ridingon theurban railway - Focusing on the Seoul Metro-" The Korean Society for railway 738-743, 2015
9 Lee,C.H., "Analysis of the Elderly Travel behavior with Using Transportation card data" The Korean Society for railway 1527-1530, 2014
10 Joh,S.W., "A Study on the improvement of the urban railway free ride program" Dept. of Railroad Sysstem Engineering The Graduate School of Engineering 2016
11 Hwang,G.Y., "A Study on the improvement of the free ride policy, Urban Railway Free Welfare System Improvement Policy Debate" 19-23, 2015
12 Kim,S.G., "A Study on the improvement of the free ride policy" Dept of Local Governments and Urban Administration Graduate School of Public Administration Yonsei University 2016
13 Moon.J.W., "A Study on the Improvement of the Free Riding System of the Private Urban Railway" Dept. of Railroad Management & Policy Graduate School of Railway Seoul National University of Science and Technology 2018
14 Kim.D.S., "A Study on the Financial Integrity of Urban Railway, Research Report" Journal of Korean Society of Transportation 113-, 2011