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3. Statistical summary of railway communication for 2018 (2019) DOI: http://www.mot.gov.cn/tongjishuju/tielu/
4. High-speed railways in China (2019) DOI: https://baike.baidu.com
5. The rating of urban nodes of high-speed railways in China (2019) DOI: http://mapi.masok.cn/wap/thread/view-thread/tid/3893699