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The 10 references without a DOI — listed, not checked
no DOI — not checked10.1016/S1365-1609(99)00124-0_BIB1
no DOI — not checkedComputer modeling and simulation of percussive drilling of rock
no DOI — not checked10.1016/S1365-1609(99)00124-0_BIB11
no DOI — not checkedA numerical simulation model of the impact penetration system
no DOI — not checked10.1016/S1365-1609(99)00124-0_BIB14
no DOI — not checked10.1016/S1365-1609(99)00124-0_BIB15
no DOI — not checkedAn analytical and experimental investigation of rock indentation fracture
no DOI — not checked10.1016/S1365-1609(99)00124-0_BIB23
no DOI — not checkedPenetration rate prediction in percussive drilling
no DOI — not checkedA study on the thrust effect in the stress wave propagation in down-the-hole rock drilling
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