1. First progress report on comparison of rock failure around an excavation in a laboratory model and in situ. I, In situ investigations;Barron;S. Afr. Counc. Sci. Indus. Res., Pretoria, Rep. MEG 435,1966
2. Grundlagenuntersuchungen über das Entspannungsbohrverfahren während des praktischen Einsatzes in grosser Tiefe;Cahnbley,1970
3. The measurement of stress in rock by E.R. Leeman: Discussion;Deacon;J. S. Afr. Inst. Mining Metall.,1965
4. Principal stress ratios in Cretaceous Limestones from Texas Gulf Coast;Friedman;Bull. Am. Assoc. Pet. Geol.,1974
5. Virgin rock stresses at Doornfontein Gold Mine, Carletonville, South Africa;Gay;J. Geol.,1972