Characteristics of Acoustic Emission Waveforms Induced by Hydraulic Fracturing of Coal under True Triaxial Stress in a Laboratory-Scale Experiment by Nan Li, Liulin Fang, Bingxiang Huang, Peng Chen, Chao Cai, Yunpeng Zhang, Xuan Liu, Zhihuai Li, Yaolin Wen, Yanli Qin

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