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Acknowledgments
We gratefully acknowledge the support given by the Natural Science Foundation of China (51474215), China Postdoctoral Science Foundation funded project (2014M561728) and 973 Program (2013CB227902).
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Zhang, K., Hou, R., Zhang, G. et al. Rock Drillability Assessment and Lithology Classification Based on the Operating Parameters of a Drifter: Case Study in a Coal Mine in China. Rock Mech Rock Eng 49, 329–334 (2016). https://doi.org/10.1007/s00603-015-0723-0
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DOI: https://doi.org/10.1007/s00603-015-0723-0