Spies, T, Hesser, J, Eisenblatter, J & Eilers, G 2005, 'Measurements of Acoustic Emission During Backfilling of Large Excavations', in Y Potvin & M Hudyma (eds), RaSiM6: Proceedings of the Sixth International Symposium on Rockburst and Seismicity in Mines Proceedings, Australian Centre for Geomechanics, Perth, pp. 379-383, https://doi.org/10.36487/ACG_repo/574_38
(https://papers.acg.uwa.edu.au/p/574_38_Spies/)