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[2] American Society of Testing and Materials (ASTM) (2008) Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classifications, D5731-08.
[3] Broch, E. and Franklin, J. (1972) International Journal of Rock Mechanics and Mining Sciences, 9, 669-697.
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[5] Jaeger, J., et al. (2007) Deformation and Failure of Rocks. Fundamentals of Rock Mechanics. 4th Edition, Blackwell Publishing, 80.
[6] American Society of Testing and Materials (ASTM) (2002) Standard Test Method for Unconfined Compressive Strength of Intact Rock Core Specimens, D2938-95(R02).
[7] American Society of Testing and Materials (ASTM) (2008) Standard Practices for Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape Tolerances, D4543-08.
[8] American Society of Testing and Materials (ASTM) (2010) Standard Test Method for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures, D7012-10.