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Yagiz, S. Discussion on “Assessment of Some Brittleness Indexes in Rock-drilling Efficiency” by Rasit Altindag, Rock Mechanics and Rock Engineering, DOI: 10.1007/s00603-009-0057-x. Rock Mech Rock Eng 43, 371–373 (2010). https://doi.org/10.1007/s00603-009-0078-5
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DOI: https://doi.org/10.1007/s00603-009-0078-5