1. Wickham, G. E., Tiedemann, H. R. and Skinner, E. H., Support determination based on geologic predictions. Proc. Rapid Excav. Tunneling Conf., AIME, New York, 1972, pp. 43–64
2. Engineering classification of jointed rock masses;Bienawski;Trans. S. Afr. Inst. Civ. Eng.,1973
3. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mech.,1974
4. Deere, D. U., Hendron, A. J., Patton, F. D. and Cording, E. J., Design of surface and near surface construction in rock. Proc. 8th U.S. Symp. Rock Mech., AIME, New York, 1967, pp. 237–302
5. Misconceptions on the new Austrian tunneling method;Müller;Tunnels Tunneling,1978