TY - RPRT TI - A hard coresoft shell microstructural model for studying percolation and transport in three-dimensional composite media AU - Bentz, Dale P AU - Garboczi, Edward J AU - Snyder, Kenneth A PY - 1999 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 6265 DO - 10.6028/NIST.IR.6265 ER -