1. Zu Yihong, Wang Yijun, Development of Automatic Measuring and Sorting Machine for Bolster Spring , Locomotive & Rolling Stock Technology, 2(2008)36-37.
2. Li Xuelei, Xu Jian, Cheng Di, Development of Automatic Detection and Sorting Equipment for Sleeper Springs of Railroad Tracks, MECHATRONICS, 11 (2)(2005)87-88.
3. Sun Yulin, Suggestion of Strengthening Maintenance of Bolster Springs, Railway Vehicl 01(40)(2002).
4. Qiu Hongxia, Li Ping and Song Chuanyun, Statistics and Analysis of Railway Tracks in our Country 50 Years [J], Railway Vehicl, 03(2000).
5. Ning Jianrong, Yin Huadong and Yang Jingli, PLC-based automatic inspection control system of bolster spring, Locomotive & Rolling Stock Technology, 1(2005)20-22.