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The author would like to thank Prof. G. Barla for his suggestions and cooperation in preparing the manuscript.
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Azimian, A. A New Method for Improving the RQD Determination of Rock Core in Borehole. Rock Mech Rock Eng 49, 1559–1566 (2016). https://doi.org/10.1007/s00603-015-0789-8
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DOI: https://doi.org/10.1007/s00603-015-0789-8