1. Fundamentals of Rock Mechanics;Jaegar,1976
2. Effect of pillar reinforcement on long-term stability of an oil shale mine;Agapito;Int. J. Min. Engng,1985
3. The use of rock bolts and wire rope to increase the strength of fractured model pillars;Horino;USBM RI 7568,1971
4. Laboratory and in situ mechanical behaviour studies of fractured oil shale pillars;Brady;Rock Mech.,1975
5. Research into the determination of pillar size;Wilson;Min. Engr,1972