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  2013, Vol. 31 Issue (11): 33-37    DOI: 10.3981/j.issn.1000-7857.2013.11.003
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Safety Thickness of Interval Layers for the Transition from Open Pit to Underground Mining
ZHANG Qinli, CHEN Qiusong, HU Wei, ZHOU Denghui
School of Resources and Safety Engineering, Central South University, Changsha 410083, China

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