1. C. Mark, G.M. Molinda, L.M. Burke, Preventing falls of ground in coal mines with exceptionally low-strength roof: two case studies, in: Proc. 23rd Int. Conf. Ground Control Min., Morgantown, WV, 2004, pp. 327–333.
2. National Institute for Occupational Health and Safety, Niosh mining program briefing book, (August 2010).
3. An Introduction to Mining Seismology;Gibowicz,1994
4. A.T. Iannacchione, T.S. Bajpayee, Forecasting roof falls with monitoring technologies – a look at the Moonee Colliery experience, in: Proc. 24th Int. Conf. Ground Control Min., Morgantown, WV, 2005, pp. 44–51.