1. Class distinction in rock masses;Laubscher,1975
2. Examen des différents procédés classiques de détermination de la nocivité des roches vis-à-vis de l'abattage méchanique;Valantin;Industrie Minerale-Mine,1974
3. On the drillability of rock by percussive drilling;Selmer-Olsen,1970
4. Drillability Determination—A Drillability Index for Percussion Drills;Tandanand;U.S. Bur. Mines, R.I. 8073,1975
5. The failure of linear brittle materials under effective tensile stress;Brown;Rock Mech.,1967