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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 41304141), the Joint Funds of the National Natural Science Foundation of China (Grant No. U1562215) and the National Basic Research Program of China (Grant No. 2015CB250903).
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Wang, X., Ge, H., Wang, J. et al. Evaluation of the Micro-cracks in Shale from the Stress Sensitivity of Ultrasonic Velocities. Rock Mech Rock Eng 49, 4929–4934 (2016). https://doi.org/10.1007/s00603-016-1027-8
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DOI: https://doi.org/10.1007/s00603-016-1027-8