1. Underground Excavations In Rock;Hoek,1980
2. The theory of rupture;Griffith,1924
3. Stresses in a plate due to the presence of cracks and sharp corners;Inglis;Inst. Naval Architecture (London),1913
4. Bearing pressures and cracks;Westergaard;J. Appl. Mech.,1939
5. Friction on Griffith cracks in rocks under pressure;McClintock,1962