1. A study of the fractures formed in the rock around an opening made by a reef boring machine.;Adams;Chamber of Mines of South Africa Research Organization, Internal Report,1978
2. High pressure water jets aid TBM's;Baumann;Tunnels and Tunelling,1981
3. Relative efficiency of picks and discs for cutting rock. Advances in rock mechanics;Evans,1974
4. The use of water jets to enhance the performance of free rolling cutters in hard rock;Fenn,1986
5. A review of mechanical rock boring in the South African gold mines;Fenn;Chamber of Mines of South Africa Research Organization, Internal Report,1983