1. The shear strength of rock and rock joints;Barton;Int. J. Rock Mech. Min. Sci. Geomech. Abstr.,1976
2. The shear strength of rock joints in theory and practice;Barton;Rock Mech.,1977
3. Gravity faulting as a mechanism of topographic adjustment;Beck;N.Z. J. Geol. Geophys.,1968
4. Engineering Rock Mass Classification;Bieniawski,1989
5. Bonsignore, G., Borgo, A., Gelati, R., Montrasio, A., Potenza, R., Pozzi, R., Ragni, U., Schiavinato, G., 1969. Note illustrative della Carta Geologica d'Italia, Foglio 8-Bormio. Servizio Geologico d'Italia, Roma.