For citation: FEDOROV B.V., KORGASBEKOV D.R. About a half-wave length of the bottom-hole core drill composed of structural elements of different stiffness. Gornye nauki i tekhnologii = Mining Science and Technology (Russia). 2016;(1):33-38. https://doi.org/10.17073/2500-0632-2016-1-33-38
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