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| 2018, Vol. 55(1): 59-64 DOI: | ||
| Sub-Classification System for Rocky Surrounding Rock of the Qingdao Metro | ||
| (Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031) | ||
| Received null Revised null | ||
| Supporting info | ||
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