1. Laboratory studies on the stability of vertical and deviated boreholes;Addis,1990
2. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mechanics and Rock Engineering,1974
3. The Q-system following twenty years of application in NMT support selection;Barton,1994
4. TBM Tunnelling in jointed and faulted Rock;Barton,2000
5. Some new Q-value correlations to assist in site characterization and tunnel design;Barton;International Journal of Rock Mechanics and Mining Sciences,2002