Lee, Kuo Chen, Rolando P. Orense, and Fu Shu Jeng. 2012. “Dynamic Frictional Behaviour of Synthetic Sandstone under Low Normal Stress and Seismic Excitation”. Bulletin of the New Zealand Society for Earthquake Engineering 45 (2), 71-76. https://doi.org/10.5459/bnzsee.45.2.71-76.