1. A review of current knowledge on roadway behaviour, especially the problems on which further information is required;King,1970
2. Design and stability of pillars in longwall mining;Whittaker;Min. Eng. (London),1979
3. Evaluation of the design requirements and performance of gate roadways;Whittaker;Min. Eng. (London),1979
4. Stability of longwall mining gate roadways in relation to rib pillar size;Whittaker;Int. J. Rock Mech. Min. Sci. Geomech. Abstr.,1981
5. An hypothesis concerning pillar stability;Wilson;Min. Eng. (NY),1972