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An empirical method for design of grouted bolts in rock tun..:

Osgoui, Reza R ; Unal, Erdal
Osgoui R. R. , Unal E., "An empirical method for design of grouted bolts in rock tunnels based on the Geological Strength Index (GSI)", ENGINEERING GEOLOGY, cilt.107, ss.154-166, 2009.  , 2009