Bobko CP, Gathier B, J. Ortega A, Ulm F-J, Borges L, Abousleiman YN.  2011.  The nanogranular origin of friction and cohesion in shale-A strength homogenization approach to interpretation of nanoindentation results. International Journal for Numerical and Analytical Methods in Geomechanics. 35(17):1854-1876.

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J. Ortega A, Gathier B, Ulm F-J.  2011.  STRENGTH HOMOGENIZATION FOR COHESIVE-FRICTIONAL COMPOSITES: A LINEAR COMPARISON COMPOSITE APPROACH. International Workshop on Multiscale and Multiphysics Processes in Geomechanics. Springer Series in Geomechanics and Geoengineering:57-60.

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