1. Borg R. An Orthotropic Material Model with Damage. Lic. Eng. thesis. Division of Solid Mechanics, Department of Mechanical Engineering, Linköping Institute of Technology, Linköping, 1998.
2. Fracture mechanics. An introduction;Gdoutos,1993
3. Nonlinear fracture mechanics for engineers;Saxena,1998
4. Yielding of steel sheets containing slits;Dugdale;Journal of the Mechanics and Physics of Solids,1960
5. The mathematical theory of equillibrium cracks in brittle fracture;Barenblatt;Advances in Applied Mechanics,1962