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Singh, T.N., Kainthola, A. & Venkatesh A Correlation Between Point Load Index and Uniaxial Compressive Strength for Different Rock Types. Rock Mech Rock Eng 45, 259–264 (2012). https://doi.org/10.1007/s00603-011-0192-z
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DOI: https://doi.org/10.1007/s00603-011-0192-z