RT Journal T1 Does High-Speed Railway Improve the Efficiency of Urban Green Development-An Empirical Test Based on Difference in Difference Model A1 RAN Qi-ying, ZHANG Jin-ning, YANG Xiao-dong PB Journal of Guizhou University of Finance and Economics FD 2020-09-15 YR 2020 JF Journal of Guizhou University of Finance and Economics JO Journal of Guizhou University of Finance and Economics VO 38 IS 05 SP 100 DO K1 High-speed railway opening;green development efficiency;DID;mediation LK {https://gcxb.gufe.edu.cn/EN/article/article_9237.shtml}