1. Stope-and-pillar design for the Elliot Lake uranium mines;Hedley;Bull Canadian Inst Miningand Metall,1972
2. Determining pillar strength from pillar failure observations;Krauland;Eng Min,1987
3. Failure modes and pillar behaviour in the Zinkgruvan mine.;Sjoberg,1992
4. The strength of hard-rock pillars;Martin;Int J Rock Mech Min Sci,2000
5. Roberts DP, Merwe JN, Canbulat I, Sellers EJ, Coetzer S. Development of a method to estimate coal pillar loading. Safety in Mines Research Advisory Committee. Sep-2002; 2002.