1. Optimizing secondary roof support with the NIOSH support technology optimization program (STOP);Barczak,2000
2. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mechanics,1974
3. Engineering classification of jointed rock masses;Bieniawski;Transaction of the South African Institution of Civil Engineers,1973
4. Rock mass classification as a design aid in tunnelling;Bieniawski;Tunnels and Tunnelling,1988
5. Development of a roof and floor classification applicable to collieries;Buddery,1992