1. Lateral Stress Relief for Long wall Access and Trunk Roadways, ECSC Final Report 7220-AB/834k;Anon,1995
2. Absolute stress and stress change measurements in British coal measures;Bigby,1992
3. Specification for Screwed and Socketed Steel Tubes and Tubulars and for Plain End Steel Tubes Suitable for Welding or for Screwing to BS 21 pipe Threads;British Standard 1387,1985
4. Numerical Analysis and Modelling in Geomechanics;Bull,2003
5. Gas Control in Underground Coal Mining;Creedy,1997