1. American Society of Metals (ASM). Handbook on failure analysis; 1989
2. Strength of materials;Ryder,1969
3. Tait RB, Radebe B, Rambocus O. Experimental determination of stress intensity factors for thumbnail and crescent moon cracks for round bars in bending and tension. FRACTURE 2000, South African National Conference, University of Cape Town, December 2000