1. Phenomena of rupture and flow in solids;Griffith;Phil. Trans. R. Soc.,1921
2. Theory of Rupture;Griffith,1924
3. Rock Fracture Under Static Stress Conditions;Hoek;C.S.I.R. Report,1965
4. Analysis of stresses and strains near the end of a crack traversing a plate;Irwin;J. appl. Mech.,1957
5. Stress Analysis of Cracks;Paris,1965