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2. Determination of Rock Properties;Bieniawski;Report of the South African Council of Scientific and Industrial Research No. MEG 518,1967
3. Mechanism of Rock Fracture in Compression;Bieniawski;Report of the South African Council of Scientific and Industrial Research No. MEG 459,1966
4. The influence of sustained loads on the strength of concrete;Glucklich;Rilem Bull.,1959
5. The Time-Dependent Behaviour of Rock; Considerations with Regard to a Research Programme;Wild;Report of the South African Council of Scientific and Industrial Research,1966